重庆酸雨区马尾松香樟混交林的土壤化学性质和林木生长特征

doi:10.3773/j.issn.1005-264x.2010.04.004

植物生态学报 ›› 2010, Vol. 34 ›› Issue (4): 387-395.DOI: 10.3773/j.issn.1005-264x.2010.04.004

重庆酸雨区马尾松香樟混交林的土壤化学性质和林木生长特征

李志勇¹^,²^,^*(), 王彦辉²^,^**(), 于澎涛², 张治军², 杜士才³, 何萍³, 王祥⁴, 段健⁵, 李振华¹

¹河南科技大学农学院, 河南洛阳 471003
²中国林业科学研究院森林生态环境与保护研究所, 国家林业局森林生态环境重点实验室, 北京 100091
³重庆市林业局, 重庆 401147
⁴重庆市江北区农林水利局, 重庆 400023
⁵重庆市铁山坪林场, 重庆 400026

收稿日期:2009-05-25 接受日期:2009-10-30 出版日期:2010-05-25 发布日期:2010-04-01
通讯作者: 王彦辉
作者简介:** E-mail: wangyh@caf.ac.cn
* E-mail: pphdll@126.com

Soil chemical properties and growth characteristics of mixed plantation of Pinus massoniana and Cinnamomum camphora in the acid rain region of Chongqing, China

LI Zhi-Yong¹^,²^,^*(), WANG Yan-Hui²^,^**(), YU Peng-Tao², ZHANG Zhi-Jun², DU Shi-Cai³, HE Ping³, WANG Xiang⁴, DUAN Jian⁵, LI Zhen-Hua¹

¹College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471003, China
²Key Laboratory of Forest Ecology Environment of the State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
³Forestry Administration of Chongqing City, Chongqing 401147, China
⁴Bureau of Agriculture, Forestry and Water Resources of Jiangbei District of Chongqing City, Chongqing 400023, China
⁵Tieshanping Forest Farm of Chongqing City, Chongqing 400026, China

Received:2009-05-25 Accepted:2009-10-30 Online:2010-05-25 Published:2010-04-01
Contact: WANG Yan-Hui

摘要/Abstract

摘要：

为给遭受酸化危害的重庆马尾松(Pinus massoniana)纯林的恢复与管理提供科学依据, 在属于酸雨区的重庆市江北区铁山坪林场, 调查了马尾松香樟(Cinnamomum camphora)混交林的土壤化学性质和林木生长状况, 并与毗邻的马尾松纯林和香樟纯林进行了比较。结果表明, 与马尾松纯林相比, 混交林腐殖质层和土壤酸度降低, 交换性盐基离子Ca²⁺和Mg²⁺含量增加, 酸性阳离子Al³⁺和H⁺含量明显减少(p < 0.05)。混交林马尾松树冠下腐殖质层和0-60 cm土层马尾松细根的干重、长度、表面积、体积和根尖数的总密度都显著低于马尾松纯林(p < 0.05), 比值分别为0.44、0.71、0.59、0.46和0.71, 马尾松树高显著低于马尾松纯林(p < 0.05), 其针叶变色率为15%, 显著高于马尾松纯林(p < 0.05), 香樟的生长特征与香樟纯林相似。结果说明, 尽管混交林的土壤化学性质优于马尾松纯林, 但林中马尾松的生长状况表现出了明显的恶化迹象, 而香樟依然比较健康, 这可能与香樟具有明显的竞争优势有关。因此, 在利用香樟营造与马尾松的混交林来改善遭受酸化危害的马尾松纯林的生长状况时, 应注意调控香樟的竞争优势。

关键词: 酸雨, 香樟, 生长, 混交林, 马尾松, 根系

Abstract:

Aims Acid rain has led to Pinus massoniana forest decline in Chongqing, Southwestern China. Cinnamomum camphora, an acid-resistant broadleaved tree species, has been widely distributed in the region. Cinnamomum camphora is thought to improve soil properties and health condition of P. massoniana; however, little information is available from mixed plantations of P. massoniana and C. camphora exposed to acid rain. Our objective was to examine soil chemical properties and growth traits of these two species in mixed plantations in the region.

Methods We investigated soil chemical properties and above- and below-ground growth condition of a mixed plantation of P. massoniana and C. camphora in the Tieshanping Forest Farm of Chongqing City. We compared results with those from adjacent pure plantations of P. massoniana and C. camphora, which were planted at the same time as the mixed plantation.

Important findings Compared with the pure P. massoniana plantation, pH values were greater in the humus and soil of the mixed plantation, contents of exchangeable Ca²⁺ and Mg²⁺ were higher, contents of exchangeable Al³⁺ and H⁺ were significantly lower (p < 0.05), the amount of fine roots of P. massoniana in the humus and soil was smaller (p < 0.05), height of dominant trees of P. massoniana was significantly lower (p < 0.05) and needle discoloration percentage of dominant trees of P. massoniana was higher (p < 0.05). Growth characteristics of C. camphora were similar to those of the pure C. camphora plantation. This study suggested that although C. camphora ameliorated soil chemical properties, health of P. massoniana of the mixed plantation worsened, which might be caused by stronger competitive abilities of C. camphora. Therefore, the competitive advantage of C. camphora against P. massoniana should be properly controlled when establishing mixed plantations of P. massoniana and C. camphora for improving the health of pure P. massoniana plantations in the region.

Key words: acid rain, Cinnamomum camphora, growth, mixed plantation, Pinus massoniana, roots

李志勇, 王彦辉, 于澎涛, 张治军, 杜士才, 何萍, 王祥, 段健, 李振华. 重庆酸雨区马尾松香樟混交林的土壤化学性质和林木生长特征. 植物生态学报, 2010, 34(4): 387-395. DOI: 10.3773/j.issn.1005-264x.2010.04.004

LI Zhi-Yong, WANG Yan-Hui, YU Peng-Tao, ZHANG Zhi-Jun, DU Shi-Cai, HE Ping, WANG Xiang, DUAN Jian, LI Zhen-Hua. Soil chemical properties and growth characteristics of mixed plantation of Pinus massoniana and Cinnamomum camphora in the acid rain region of Chongqing, China. Chinese Journal of Plant Ecology, 2010, 34(4): 387-395. DOI: 10.3773/j.issn.1005-264x.2010.04.004

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图/表 5

参考文献 31

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项目 Item	香樟根系 Roots of Cinnamomum camphora	马尾松根系 Roots of Pinus massoniana
外形 Appearance	各径级的根较直 The roots of different diameters were relatively straight	各径级的根较弯曲 The roots of different diameters were relatively curved
颜色 Color	新生的细根为带黄色的乳白色, 径级2-5、5-10和>10 mm的根分别为淡黄棕色、棕褐色和棕黄色 The newly born fine roots were milk white with a tincture of yellow, and the roots of 2-5 mm diameter, the roots of 5-10 mm diameter and the roots of >10 mm diameter were pale yellowish brown, dark brown and brownish yellow, respectively	新生的细根为带棕色的乳白色, 径级2-5、5-10和>10 mm的根分别为淡棕红色、浅棕红色和棕红色 The newly born fine roots were milk white with a tincture of brown, and the roots of 2-5 mm diameter, the roots of 5-10 mm diameter and the roots of >10 mm diameter were pale brownish red, light brownish red and brownish red, respectively
弹性 Elasticity	各径级的根弹性较小, 弯曲时易折断 The roots of different diameters had low flexibility and were easily broken when bent	各径级的根弹性较大, 弯曲时不易折断 The roots of different diameters were flexible and not easily broken when bent
表皮剥离的难易程度 The degree of difficulty to peel off the epidermis	各径级的根的表皮不易剥离 It was difficult to peel off the epidermis of the roots of different diameters	各径级的根的表皮易剥离 It was easy to peel off the epidermis of the roots of different diameters
气味 Odor	各径级的根具有香樟特有的清香气味 The roots of different diameters had faint scent typical of Cinnamomum camphora	各径级的根具有松脂气味 The roots of different diameters had odor of pine resin

项目 Item	香樟根系 Roots of Cinnamomum camphora	马尾松根系 Roots of Pinus massoniana
外形 Appearance	各径级的根较直 The roots of different diameters were relatively straight	各径级的根较弯曲 The roots of different diameters were relatively curved
颜色 Color	新生的细根为带黄色的乳白色, 径级2-5、5-10和>10 mm的根分别为淡黄棕色、棕褐色和棕黄色 The newly born fine roots were milk white with a tincture of yellow, and the roots of 2-5 mm diameter, the roots of 5-10 mm diameter and the roots of >10 mm diameter were pale yellowish brown, dark brown and brownish yellow, respectively	新生的细根为带棕色的乳白色, 径级2-5、5-10和>10 mm的根分别为淡棕红色、浅棕红色和棕红色 The newly born fine roots were milk white with a tincture of brown, and the roots of 2-5 mm diameter, the roots of 5-10 mm diameter and the roots of >10 mm diameter were pale brownish red, light brownish red and brownish red, respectively
弹性 Elasticity	各径级的根弹性较小, 弯曲时易折断 The roots of different diameters had low flexibility and were easily broken when bent	各径级的根弹性较大, 弯曲时不易折断 The roots of different diameters were flexible and not easily broken when bent
表皮剥离的难易程度 The degree of difficulty to peel off the epidermis	各径级的根的表皮不易剥离 It was difficult to peel off the epidermis of the roots of different diameters	各径级的根的表皮易剥离 It was easy to peel off the epidermis of the roots of different diameters
气味 Odor	各径级的根具有香樟特有的清香气味 The roots of different diameters had faint scent typical of Cinnamomum camphora	各径级的根具有松脂气味 The roots of different diameters had odor of pine resin

林分 Stand	层次 Layer (cm)	交换性阳离子 Exchangeable cation (cmol(+)·kg^-1)						盐基饱和度Base saturation (%)	pH (KCl)
林分 Stand	层次 Layer (cm)	K⁺	Na⁺	Ca²⁺	Mg²⁺	Al³⁺	H⁺	盐基饱和度Base saturation (%)	pH (KCl)
马尾松香樟混交林 Mixed plantation of P. massoniana and C. camphora	腐殖质层 Humus layer (0.63)	0.228 0 ± 0.011 2^a	0.069 5 ± 0.007 4^d	1.647 3 ± 0.009 1^a	0.362 6 ± 0.008 1^a	3.976 3 ± 0.201 8^b	3.876 7 ± 0.075 4^b	22.02	3.37±0.01^c
	0-20	0.041 2 ± 0.002 1^b	0.087 7 ± 0.005 3^d	0.316 8 ± 0.006 3^e	0.081 4 ± 0.005 5^d	1.367 0 ± 0.093 2^d	1.984 0 ± 0.088 5^d	13.44	3.97±0.02^b
	20-40	0.027 7 ± 0.002 9^c	0.085 9 ± 0.004 6^d	1.061 8 ± 0.010 4^b	0.149 2 ± 0.007 2^c	1.570 0 ± 0.094 7^d	2.018 0 ± 0.132 3^d	26.75	3.92 ± 0.02^b
	40-60	0.030 0 ± 0.002 5^c	0.100 1 ± 0.008 2^d	1.107 4 ± 0.007 9^b	0.293 0 ± 0.008 1^b	1.500 7 ± 0.084 4^d	2.045 2 ± 0.095 6^d	29.21	4.07 ± 0.03^a
马尾松纯林 Pure P. massoniana plantation	腐殖质层 Humus layer (1.99)	0.206 1 ± 0.010 3^a	0.109 4 ± 0.007 5^d	1.638 3 ± 0.019 8^a	0.306 0 ± 0.012 0^b	6.404 6 ± 0.231 6^a	5.934 7 ± 0.120 4^a	14.99	3.02 ± 0.03^d
	0-20	0.047 2 ± 0.003 3^b	0.093 8 ± 0.009 9^d	0.277 3 ± 0.008 4^e	0.059 2 ± 0.009 0^e	2.180 5 ± 0.214 6^c	2.446 7 ± 0.208 0^c	9.25	3.78 ± 0.10^b
	20-40	0.009 8 ± 0.000 8^d	0.114 2 ± 0.006 9^d	0.403 2 ± 0.015 2^d	0.097 3 ± 0.005 1^d	2.151 8 ± 0.210 0^c	2.498 8 ± 0.130 4^c	11.68	3.88 ± 0.02^b
	40-60	0.027 0 ± 0.003 0^c	0.094 2 ± 0.006 0^d	0.927 6 ± 0.006 7^c	0.203 8 ± 0.017 2^c	2.077 1 ± 0.209 9^c	2.483 9 ± 0.095 2^c	20.96	3.89 ± 0.03^b
香樟纯林 Pure C. camphora plantation	腐殖质层 Humus layer (0.80)	0.179 8 ± 0.009 4^a	0.080 4 ± 0.003 0^d	1.651 8 ± 0.007 8^a	0.373 4 ± 0.007 7^a	3.392 1 ± 0.190 4^b	3.070 0 ± 0.058 5^c	25.15	3.53 ± 0.02^c
	0-20	0.023 1 ± 0.002 0^c	0.090 9 ± 0.006 2^d	0.407 2 ± 0.003 1^d	0.092 4 ± 0.004 8^d	1.664 4 ± 0.106 7^c	2.254 1 ± 0.121 6^c	13.11	3.91 ± 0.09^b
	20-40	0.008 7 ± 0.001 1^d	0.095 2 ± 0.004 7^d	1.188 1 ± 0.011 5^b	0.299 6 ± 0.010 1^b	0.719 8 ± 0.017 4^e	1.021 7 ± 0.118 9^e	45.06	4.23 ± 0.02^a
	40-60	0.021 6 ± 0.002 5^c	0.078 0 ± 0.005 7^d	1.499 5 ± 0.009 2^a	0.441 8 ± 0.013 1^a	0.220 2 ± 0.013 6^f	0.459 7 ± 0.014 5^f	55.14	4.62 ± 0.02^a

林分 Stand	层次 Layer (cm)	交换性阳离子 Exchangeable cation (cmol(+)·kg^-1)						盐基饱和度Base saturation (%)	pH (KCl)
林分 Stand	层次 Layer (cm)	K⁺	Na⁺	Ca²⁺	Mg²⁺	Al³⁺	H⁺	盐基饱和度Base saturation (%)	pH (KCl)
马尾松香樟混交林 Mixed plantation of P. massoniana and C. camphora	腐殖质层 Humus layer (0.63)	0.228 0 ± 0.011 2^a	0.069 5 ± 0.007 4^d	1.647 3 ± 0.009 1^a	0.362 6 ± 0.008 1^a	3.976 3 ± 0.201 8^b	3.876 7 ± 0.075 4^b	22.02	3.37±0.01^c
	0-20	0.041 2 ± 0.002 1^b	0.087 7 ± 0.005 3^d	0.316 8 ± 0.006 3^e	0.081 4 ± 0.005 5^d	1.367 0 ± 0.093 2^d	1.984 0 ± 0.088 5^d	13.44	3.97±0.02^b
	20-40	0.027 7 ± 0.002 9^c	0.085 9 ± 0.004 6^d	1.061 8 ± 0.010 4^b	0.149 2 ± 0.007 2^c	1.570 0 ± 0.094 7^d	2.018 0 ± 0.132 3^d	26.75	3.92 ± 0.02^b
	40-60	0.030 0 ± 0.002 5^c	0.100 1 ± 0.008 2^d	1.107 4 ± 0.007 9^b	0.293 0 ± 0.008 1^b	1.500 7 ± 0.084 4^d	2.045 2 ± 0.095 6^d	29.21	4.07 ± 0.03^a
马尾松纯林 Pure P. massoniana plantation	腐殖质层 Humus layer (1.99)	0.206 1 ± 0.010 3^a	0.109 4 ± 0.007 5^d	1.638 3 ± 0.019 8^a	0.306 0 ± 0.012 0^b	6.404 6 ± 0.231 6^a	5.934 7 ± 0.120 4^a	14.99	3.02 ± 0.03^d
	0-20	0.047 2 ± 0.003 3^b	0.093 8 ± 0.009 9^d	0.277 3 ± 0.008 4^e	0.059 2 ± 0.009 0^e	2.180 5 ± 0.214 6^c	2.446 7 ± 0.208 0^c	9.25	3.78 ± 0.10^b
	20-40	0.009 8 ± 0.000 8^d	0.114 2 ± 0.006 9^d	0.403 2 ± 0.015 2^d	0.097 3 ± 0.005 1^d	2.151 8 ± 0.210 0^c	2.498 8 ± 0.130 4^c	11.68	3.88 ± 0.02^b
	40-60	0.027 0 ± 0.003 0^c	0.094 2 ± 0.006 0^d	0.927 6 ± 0.006 7^c	0.203 8 ± 0.017 2^c	2.077 1 ± 0.209 9^c	2.483 9 ± 0.095 2^c	20.96	3.89 ± 0.03^b
香樟纯林 Pure C. camphora plantation	腐殖质层 Humus layer (0.80)	0.179 8 ± 0.009 4^a	0.080 4 ± 0.003 0^d	1.651 8 ± 0.007 8^a	0.373 4 ± 0.007 7^a	3.392 1 ± 0.190 4^b	3.070 0 ± 0.058 5^c	25.15	3.53 ± 0.02^c
	0-20	0.023 1 ± 0.002 0^c	0.090 9 ± 0.006 2^d	0.407 2 ± 0.003 1^d	0.092 4 ± 0.004 8^d	1.664 4 ± 0.106 7^c	2.254 1 ± 0.121 6^c	13.11	3.91 ± 0.09^b
	20-40	0.008 7 ± 0.001 1^d	0.095 2 ± 0.004 7^d	1.188 1 ± 0.011 5^b	0.299 6 ± 0.010 1^b	0.719 8 ± 0.017 4^e	1.021 7 ± 0.118 9^e	45.06	4.23 ± 0.02^a
	40-60	0.021 6 ± 0.002 5^c	0.078 0 ± 0.005 7^d	1.499 5 ± 0.009 2^a	0.441 8 ± 0.013 1^a	0.220 2 ± 0.013 6^f	0.459 7 ± 0.014 5^f	55.14	4.62 ± 0.02^a

林分 Stand	取样位置 Sampling position	根系类型 Root type	根系直径 Root diameter (mm)	干重总密度 Total dry weight density (g·m^-3)	长度总密度 Total length density (m·m^-3)	表面积总密度 Total surface area density (m²·m^-3)	体积总密度 Total volume density (cm³·m^-3)	根尖总密度 Total root tip density (No.·m^-3)
马尾松香樟混交林 Mixed plantation of P. massoniana and C. camphora	香樟树冠下 Under crowns of C. camphora trees	香樟根系 Roots of C. camphora	≤2	1 746.29 ± 55.67^b	22 908.74 ± 1101.72^a	62.92 ± 5.50^a	13 802.72 ± 341.16^a	2 492 299 ± 260 254^a
			>2	2 608.20 ± 80.31^a	337.08 ± 14.31^f	4.07 ± 0.40^d	11 184.98 ± 277.52^a
			合计 Total	4 354.49	23 245.82	66.99	24 987.70
		马尾松根系 Roots of P. massoniana	≤2	32.27 ± 1.99^g	239.91 ± 10.08^g	0.64 ± 0.02^f	142.61 ± 3.40ⁱ	25 994 ± 2 184^e
			>2	102.51 ± 3.47^f	44.46 ± 2.38^h	0.49 ± 0.02^f	425.27 ± 9.12^h
			合计 Total	134.78	284.37	1.13	567.88
	马尾松树冠下 Under crowns of P. massoniana trees	香樟根系 Roots of Cinnamomum camphora	≤2	248.38 ± 7.09^d	3 837.30 ± 189.69^b	10.99 ± 1.02^b	2 533.39 ± 61.58^e	435 065 ± 32 401^c
			>2	176.50 ± 5.23^e	62.56 ± 3.16^h	0.71 ± 0.03^f	743.64 ± 17.64^g
			合计 Total	424.88	3 899.86	11.70	3 277.03
		马尾松根系 Roots of P. massoniana	≤2	280.43 ± 7.87^d	3 077.72 ± 149.15^c	7.78 ± 0.71^c	1 574.85 ± 36.41^f	392 091 ± 30 253^d
			>2	688.11 ± 21.58^c	214.18 ± 9.73^g	2.05 ± 0.20^e	2 293.40 ± 55.63^e
			合计 Total	968.54	3 291.90	9.83	3 868.25
马尾松纯林 Pure plant- ation of P. massoniana	马尾松树冠下 Under crowns of P. massoniana trees	马尾松根系 Roots of P. massoniana	≤2	635.68 ± 19.12^c	4 325.66 ± 212.44^b	13.24 ± 1.10^b	3 395.27 ± 81.11^d	550 516 ± 45 781^b
			>2	1 875.13 ± 57.66^b	435.76 ± 19.85^e	4.86 ± 0.41^d	6 403.00 ± 157.46^c
			合计 Total	2 510.81	4 761.42	18.10	9 798.27
香樟纯林 Pure plant- ation of C. camphora	香樟树冠下Under crowns of C. camphora trees	香樟根系 Roots of C. camphora	≤2	1 599.48 ± 50.33^b	25 417.83 ± 1 228.05^a	64.33 ± 5.91^a	13 118.76 3 ± 25.47^a	3184 884 ± 323 210^a
			>2	3 162.49 ± 94.01^a	693.52 ± 32.66^d	7.76 ± 0.71^c	9 595.72 ± 237.10^b
			合计 Total	4 761.97	26 111.35	72.09	22 714.48

重庆酸雨区马尾松香樟混交林的土壤化学性质和林木生长特征

Soil chemical properties and growth characteristics of mixed plantation of Pinus massoniana and Cinnamomum camphora in the acid rain region of Chongqing, China

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林分 Stand	树种 Species	优势木平均冠层厚度 Mean canopy thickness of dominant trees (m)	优势木平均冠幅 Mean crown size of dominant trees (m)	优势木平均叶量损失率 Mean defoliation percentage of dominant trees (%)	优势木平均叶片变色率 Mean discoloration percentage of dominant trees (%)	优势木平均高度 Mean height of dominant trees (m)	优势木平均胸径 Mean diameter at breast height of dominant trees (cm)
马尾松香樟混交林 Mixed plantation of P. massoniana and C. camphora	香樟 C. camphora	3.33 ± 0.08^a	5.08 ± 0.20^a	13 ± 3^b	1 ± 0^b	10.3 ± 0.6^a	16.8 ± 0.4^a
	马尾松 P. massoniana	2.88 ± 0.03^b	3.36 ± 0.08^b	32 ± 10^a	15 ± 3^a	8.9 ± 0.1^c	14.0 ± 0.2^b
马尾松纯林 Pure plantation of P. massoniana	马尾松 P. massoniana	3.08 ± 0.03^b	3.64 ± 0.10^b	29 ± 13^a	2 ± 1^b	9.5 ± 0.2^b	14.6 ± 0.3^b
香樟纯林 Pure plantation of C. camphora	香樟 C. camphora	3.27 ± 0.09^a	4.94 ± 0.18^a	11 ± 4^b	1 ± 0^b	10.4 ± 0.6^a	16.5 ± 0.4^a

取样位置 Sampling position	细根类型 Fine root type	层次 Layer (cm)	干重密度 Dry weight density (g·m^-3)	长度密度 Length density (m·m^-3)	表面积密度 Surface area density (m²·m^-3)	体积密度 Volume density (cm³·m^-3)	根尖密度 Root tip density (No.·m^-3)
香樟树冠下 Under crowns of C. camphora trees	香樟细根 Fine roots of C. camphora	腐殖质层 Humus layer (0.63)	1 650.08 ± 48.11^a	21 968.75 ± 980.16^a	60.25 ± 5.05^a	13 176.75 ± 302.57^a	2 382 564 ± 201 647^a
		0-20	74.69 ± 2.32^c	694.80 ±30.55^d	2.00 ± 0.22^d	473.33 ± 10.30^d	79 339 ± 6 582^c
		20-40	17.84 ± 0.44^f	128.54 ± 5.75^f	0.41 ± 0.03^f	105.00 ± 2.39^f	13 910 ± 1 068^e
		40-60	3.68 ± 0.11^h	116.66 ± 4.79^f	0.26 ± 0.02^f	47.63 ± 1.05^g	16 487 ± 1 350^e
	马尾松细根 Fine roots of P. massoniana	腐殖质层 Humus layer (0.63)	8.49 ± 0.32^g	100.32 ± 4.01^f	0.20 ± 0.02^g	26.54 ± 0.61^h	10 616 ± 959^e
		0-20	14.26 ± 0.41^f	103.62 ± 4.74^f	0.30 ± 0.03^f	71.66 ± 1.65^g	1 125 ± 108^h
		20-40	1.10 ± 0.07ⁱ	2.00 ± 0.09ⁱ	0.01 ± 0ⁱ	4.36 ± 0.12ⁱ	54 ± 6ⁱ
		40-60	8.42 ± 0.24^g	33.97 ± 1.24^h	0.13 ± 0.01^h	40.06 ± 1.13^g	4 071 ± 356^g
马尾松树冠下 Under crowns of P. massoniana trees	香樟细根 Fine roots of C. camphora	腐殖质层 Humus layer (0.63)	220.09 ± 6.34^b	3519.48 ± 165.94^b	10.10 ± 1.51^b	2 332.99 ± 54.80^b	393 769 ± 37 610^b
		0-20	22.40 ± 0.69^e	253.38 ± 10.36^e	0.70 ± 0.05^e	158.17 ± 3.46^e	33 121 ± 3 250^d
		20-40	5.89 ± 0.15^h	64.45 ± 2.90^g	0.19 ± 0.02^g	42.23 ± 1.17^g	8 175 ± 732^f
		40-60	0^j	0^j	0^j	0^j	0^j
	马尾松细根 Fine roots of P. massoniana	腐殖质层 Humus layer (0.63)	242.00 ± 7.14^b	2 757.65 ± 125.64^c	6.86 ± 0.07^c	1 360.91 ± 32.18^c	352 726 ± 32 676^b
		0-20	34.90 ± 1.08^d	275.19 ± 11.55^e	0.80 ± 0.06^e	190.68 ± 4.71^e	33 519 ± 2 763^d
		20-40	3.53 ± 0.09^h	44.88 ± 2.01^h	0.11 ± 0.01^h	23.26 ± 0.42^h	5 846 ± 501^g
		40-60	0^j	0^j	0^j	0^j	0^j

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