植物生态学报 ›› 2009, Vol. 33 ›› Issue (1): 53-62.DOI: 10.3773/j.issn.1005-264x.2009.01.006
收稿日期:
2008-02-28
接受日期:
2008-06-05
出版日期:
2009-02-28
发布日期:
2009-01-30
作者简介:
E-mail: wanggj652@163.com
基金资助:
WANG Guang-Jun, TIAN Da-Lun(), YANG Wen-De, ZHU Fan, LI Shu-Zhan
Received:
2008-02-28
Accepted:
2008-06-05
Online:
2009-02-28
Published:
2009-01-30
摘要:
亚热带杉木(Cunninghamia lanceolata)和马尾松(Pinus massoniana)在我国森林资源中占有十分重要的地位, 研究它们的土壤与表层凋落物的呼吸有助于了解它们的碳源汇时空分布格局及碳循环过程的关键驱动因子。采用Li-Cor 6400-09连接到Li-6400便携式CO2/H2O分析系统测定湖南两种针叶林群落(2007年1月至12月)的土壤呼吸及其相关根生物量和土壤水热因子。研究结果表明: 杉木和马尾松群落中土壤呼吸的季节变化显著, 在季节动态上的趋势相似, 都呈不规则曲线格局, 全年土壤呼吸速率平均值分别为186.9 mg CO2·m-2·h-1和242.4 mg CO2·m-2·h-1。从1月开始, 两种群落的土壤呼吸速率由最小值33.9 mg CO2·m-2·h-1和38.6 mg CO2·m-2·h-1随着气温的升高而升高, 杉木群落到7月底达到全年中最大值326.3 mg CO2·m-2·h-1, 而马尾松群落到8月中旬达到最大值467.3 mg CO2·m-2·h-1, 土壤呼吸的季节变化与土壤温度呈显著的指数相关, 土壤温度可以分别解释土壤呼吸变化的91.7%和78.0%, 和土壤含水量呈二次方程关系, 土壤含水量可以解释土壤呼吸变化的5.4%和8.4%。由土壤呼吸与土壤温度拟合的指数方程计算Q10值, 杉木和马尾松群落中全年土壤呼吸的Q10值分别为2.26和2.13, Q10值随着温度升高逐渐减小。两种群落土壤呼吸的差异主要受群落植被的根生物量、群落的凋落物量的影响。
王光军, 田大伦, 闫文德, 朱凡, 李树战. 亚热带杉木和马尾松群落土壤系统呼吸及其影响因子. 植物生态学报, 2009, 33(1): 53-62. DOI: 10.3773/j.issn.1005-264x.2009.01.006
WANG Guang-Jun, TIAN Da-Lun, YANG Wen-De, ZHU Fan, LI Shu-Zhan. SOIL SYSTEM RESPIRATION AND ITS CONTROLLING FACTORS IN CUNNINGHAMIA LANCEOLATA AND PINUS MASSONIANA COMMUNITIES OF SUBTROPICAL CHINA. Chinese Journal of Plant Ecology, 2009, 33(1): 53-62. DOI: 10.3773/j.issn.1005-264x.2009.01.006
森林类型 Forest types | 年龄 Year (a) | 每公顷株数 No. of per hm2 | 胸径 Chest diameter (cm) | 树高 Height of tree (m) | 枝下高 Height of branch (m) | 郁闭度 Crown density |
---|---|---|---|---|---|---|
杉木 Cunninghamia lanceolata | 18 | 1 102 | 16.26 | 12.47 | 5.26 | 0.8 |
马尾松 Pinus massoniana | 33 | 690 | 18.65 | 13.57 | 7.83 | 0.6 |
表1 两种森林群落的基本情况
Table 1 Base instances of 2 types forest communities
森林类型 Forest types | 年龄 Year (a) | 每公顷株数 No. of per hm2 | 胸径 Chest diameter (cm) | 树高 Height of tree (m) | 枝下高 Height of branch (m) | 郁闭度 Crown density |
---|---|---|---|---|---|---|
杉木 Cunninghamia lanceolata | 18 | 1 102 | 16.26 | 12.47 | 5.26 | 0.8 |
马尾松 Pinus massoniana | 33 | 690 | 18.65 | 13.57 | 7.83 | 0.6 |
森林类型 Forest type | 全C Total C (mg C·g-1) | 全N Total N (mg N·g-1) | 碳/氮 C/N | pH | 土壤密度 Soil density (g·cm-1) | 细根 Fine root mass (g·m-2) | 粗根 Coarse root mass (g·m-2) | 凋落物 Litter production (g·m-2·a-1) |
---|---|---|---|---|---|---|---|---|
杉木 Cunninghamia lanceolata | 7.81(0.24) | 0.89(0.5) | 11.83 | 3.55 | 1.52(0.02) | 456.01(53.69) | 1 163. 81(62.92) | 575.1((51.5) |
马尾松 Pinus massoniana | 8.38(0.03) | 0.67(0.06) | 12.76 | 3.70 | 1.58(0.08) | 566. 32(81.20) | 1 565.01(190.11) | 1 157.5(145.1) |
表2 两种森林群落的土壤理化特性、根生物量和凋落物量
Table 2 Soil physical chemical properties, biomass of roots and litter production in 2 plots over 0-60 cm soil depth
森林类型 Forest type | 全C Total C (mg C·g-1) | 全N Total N (mg N·g-1) | 碳/氮 C/N | pH | 土壤密度 Soil density (g·cm-1) | 细根 Fine root mass (g·m-2) | 粗根 Coarse root mass (g·m-2) | 凋落物 Litter production (g·m-2·a-1) |
---|---|---|---|---|---|---|---|---|
杉木 Cunninghamia lanceolata | 7.81(0.24) | 0.89(0.5) | 11.83 | 3.55 | 1.52(0.02) | 456.01(53.69) | 1 163. 81(62.92) | 575.1((51.5) |
马尾松 Pinus massoniana | 8.38(0.03) | 0.67(0.06) | 12.76 | 3.70 | 1.58(0.08) | 566. 32(81.20) | 1 565.01(190.11) | 1 157.5(145.1) |
图1 杉木、马尾松群落与会同生态站的土壤温度、湿度、日降雨量的季节变化
Fig. 1 Seasonal variations of soil respiration, soil moistures at 5 cm soil depth, and daily precipitation of Cunninghamia lanceolata and Pinus massoniana communities and Huitong ecological station for Chinese fir plantations during 2007
图2 杉木和马尾松群落的土壤呼吸、温度和湿度季节动态
Fig. 2 Seasonal dynamics of soil respiration rate, temperature and moisture in Cunninghamia lanceolata and Pinus massoniana communities during 2007
图3 杉木和马尾松群落土壤呼吸与土壤温度相关关系
Fig. 3 Relationships between soil respiration rates and soil temperatures in 5 cm soil depth in Cunninghamia lanceolata and Pinus massoniana communities
图4 杉木和马尾松群落土壤呼吸与土壤湿度相关关系
Fig. 4 Relationships between soil respiration rates and soil moisture in 5 cm soil depth in Cunninghamia lanceolata and Pinus massoniana communities
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