杉木林年龄序列地下碳分配变化

doi:10.3773/j.issn.1005-264x.2008.06.009

摘要/Abstract

摘要：

森林地下碳分配在森林碳平衡和碳吸存中具有重要作用, 而揭示人工林生长过程中地下碳分配变化对于人工林碳汇估算和碳汇管理等有重要意义。通过采用年龄序列方法研究了杉木(Cunninghamia lanceolata)林生长过程中地下碳分配变化特点。年龄序列为福建省南平7 a生(幼龄林)、16 a生(中龄林)、21 a生(近熟林)、41 a生(成熟林)和88 a生(老龄林)的杉木林。细根净生产力测定采用连续土芯法, 根系呼吸测定采用壕沟法, 生物量增量测定采用异速生长方程, 地上年凋落物量采用凋落物收集框测定。结果表明: 杉木林细根净生产力在中龄林前没有显著差异, 维持在较高水平; 但此后则显著下降。细根净生产力/地上凋落物量比值随林龄增加而显著下降。老龄林的根系呼吸显著低于其它林龄林分, 根系呼吸与细根生物量间呈显著线性相关。中龄林和近成熟林的地下碳分配(Total belouground carbon allocation, TBCA)显著高于幼龄林和成熟林, 而老龄林的则最低。中龄林、近成熟林和成熟林的地上部分净生产力/TBCA比值显著高于幼龄林和老龄林, 而杉木林的根系碳利用效率(RCUE)则呈现出随林龄增加而降低的趋势。

关键词: 杉木林, 年龄序列, 地下碳分配, 细根净生产力, 根系呼吸

Abstract:

Aims Total belowground carbon allocation represents an important carbon flux in forest ecosystems and is closely related to carbon sequestration. Knowledge of how it changes with stand age in forest plantations is essential for carbon accounting and carbon management. Our primary objective is to elucidate changes in total belowground carbon allocation in a Chinese fir (Cunninghamia lanceolata) chronosequence.

Methods We selected an age sequence of 7 (young), 16 (middle-age), 21 (pre-mature), 41 (mature) and 88 year (old-growth) Chinese fir plantations with similar site conditions in Nanping, Fujian. Fine root production was determined by sequential soil coring, root respiration by trenching, current annual increment of tree biomass by allometric equations and annual litterfall by litter traps.

Important findings Annual fine root production (P_fr) was relatively high and statistically similar prior to the middle-age stage, but decreased in the following stages. The ratio of P_fr/litterfall decreased with stand age. Root respiration, which was linearly correlated to living fine root biomass, was lower in old-growth forest than in other forests. Total belowground carbon allocation (TBCA) was higher in middle-age and pre-mature forests than in young and mature forests and was lowest in old-growth forest. The ratio of aboveground net primary production to TBCA was higher in middle-age, pre-mature and mature forests than in young and old-growth forests. Root carbon use efficiency decreased with stand age.

Key words: Chinese fir, chronosequence, total belowground carbon allocation, fine root production, root respiration

陈光水, 杨玉盛, 高人, 谢锦升, 杨智杰, 毛艳玲. 杉木林年龄序列地下碳分配变化. 植物生态学报, 2008, 32(6): 1285-1293. DOI: 10.3773/j.issn.1005-264x.2008.06.009

CHEN Guang-Shui, YANG Yu-Sheng, GAO Ren, XIE Jin-Sheng, YANG Zhi-Jie, MAO Yan-Ling. CHANGES IN BELOWGROUND CARBON ALLOCATION IN A CHINESE FIR CHRONOSEQUENCE IN FUJIAN PROVINCE, CHINA. Chinese Journal of Plant Ecology, 2008, 32(6): 1285-1293. DOI: 10.3773/j.issn.1005-264x.2008.06.009

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链接本文: https://www.plant-ecology.com/CN/10.3773/j.issn.1005-264x.2008.06.009

https://www.plant-ecology.com/CN/Y2008/V32/I6/1285

图/表 9

表1 杉木林年龄序列试验地概况

Table 1 Site characteristics in a Chinese fir chronosequence

林龄 Stand age (a)	龄组 Age class	平均胸径 Mean DBH (cm)	平均树高 Mean tree height (m)	坡度 Slope	坡向 Aspect	密度 Stem density (株·hm^-2)
7	幼龄 Young	8.0	6.0	15°	NW20°	4 892
16	中龄 Middle-age	11.0	11.8	34°	NW25°	3 875
21	近熟 Pre-mature	14.7	13.0	32°	NW28°	2 800
41	成熟 Mature	24.3	25.2	40°	SW10°	1 317
88	老龄 Old-growth	32.8	32.2	30°	SW80°	750

表2 杉木林年龄序列细根生物量、生产力及周转

Table 2 Fine root biomass, production and turnover rate in a Chinese fir chronosequence

林龄 Stand age (a)	细根生物量 Fine root biomass (10³ kg C·hm^-2)			细根净生产力 Fine root production (10³ kg C·hm^-2·a^-1)			细根周转速率 Fine root turnover rate (a^-1)
林龄 Stand age (a)	0~1mm	1~2mm	总和total	0~1mm	1~2mm	总和total	0~1mm	1~2mm	总和total
7	0.879^a	0.379^a	1.258^bc	1.706^a	0.345^ab	2.051^a	1.94^ab	0.92^a	1.63^a
	(0.115)	(0.047)	(0.105)	(0.248)	(0.058)	(0.195)	(0.04)	(0.19)	(0.07)
16	0.964^a	0.636^b	1.599^a	1.691^a	0.560^c	2.251^a	1.75^ab	0.89^a	1.41^a
	(0.104)	(0.099)	(0.138)	(0.305)	(0.066)	(0.248)	(0.16)	(0.15)	(0.17)
21	0.864^a	0.530^b	1.394^b	1.876^a	0.432^a	2.308^a	2.17^a	0.82^a	1.65^a
	(0.102)	(0.042)	(0.060)	(0.246)	(0.070)	(0.298)	(0.04)	(0.19)	(0.14)
40	0.674^c	0.420^a	1.094^c	1.072^b	0.316^b	1.388^b	1.63^b	0.76^a	1.28^b
	(0.113)	(0.049)	(0.093)	(0.156)	(0.034)	(0.170)	(0.42)	(0.08)	(0.26)
88	0.379^b	0.224^c	0.603^d	0.593^c	0.138^d	0.731^c	1.61^b	0.64^a	1.22^b
	(0.061)	(0.037)	(0.034)	(0.074)	(0.018)	(0.056)	(0.40)	(0.20)	(0.14)

图1 杉木林年龄序列根系生产力变化图中柱状为平均值, 杠表示标准差, n=3 Data are mean±SD, n=3 不同年龄间存在相同字母表示无显著差异(p>0.05), 否则则存在显著差异(p<0.05) Same letters between stand ages indicate no significant difference (p>0.05), otherwise significant difference (p<0.05)

Fig. 1 Age-related changes in root production in a Chinese fir chronosequence

图2 杉木林年龄序列细根生产力/地上凋落物比值变化图注同图1 Notes are the same as Fig. 1

Fig. 2 Age-related changes in ratio of fine root production / litterfall in a Chinese fir chronosequence

图3 杉木林年龄序列根系呼吸变化图注同图1

Fig. 3 Age-related changes in root respiration in a Chinese fir chronosequence Notes are the same as Fig. 1

图4 杉木林年龄序列根系呼吸与细根生物量的关系

Fig. 4 Linear regression of root respiration against fine root biomass in a Chinese fir chronosequence

图5 杉木林年龄序列地下碳分配变化图注同图1

Fig. 5 Age-related changes in total belowground carbon allocation (TBCA) in a Chinese fir chronosequence Notes are the same as Fig. 1

图6 杉木林年龄序列地下碳分配与地上净生产力的关系

Fig. 6 Linear regression of total belowground carbon allocation (TBCA) against aboreground net primarl productivity (ANPP) in a Chinese fir chronosequence

图7 杉木林年龄序列根系碳利用效率和地上净生产力(ANPP)/地下碳分配(TBCA)比率变化 ANPP: Aboveground net primary productivity TBCA: total belowground carbon allocation 图注同图1

Fig. 7 Age-related changes in root carbon use efficiency (RCUE) and ANPP/TBCA ratio in a Chinese fir chronosequence Notes see Fig.1

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