植物生态学报 ›› 2006, Vol. 30 ›› Issue (6): 887-893.DOI: 10.17521/cjpe.2006.0112
• 论文 • 下一篇
收稿日期:
2006-01-26
接受日期:
2006-06-02
出版日期:
2006-01-26
发布日期:
2006-11-30
通讯作者:
周广胜
作者简介:
* E-mail: gszhou@ibcas.ac.cn基金资助:
WANG Xu, ZHOU Guang-Sheng(), JIANG Yan-Ling, LI Feng
Received:
2006-01-26
Accepted:
2006-06-02
Online:
2006-01-26
Published:
2006-11-30
Contact:
ZHOU Guang-Sheng
摘要:
利用静态箱式法测定长白山红松(Pinus koraiensis)针阔混交林及其开垦农田的土壤呼吸作用。结果表明,两者土壤呼吸作用的日动态和季节动态均主要受温度影响,农田土壤呼吸作用的日变化极值出现时间较林地提前,最大值出现在12∶00左右,比林地提前6 h左右,最小值在凌晨5∶00左右,早于林地2~3 h;在生长季,土壤呼吸速率与10 cm土壤含水量关系不显著,而与土壤5 cm温度呈显著的指数关系;农田土壤温度高于林地,但在整个生长季(5~9月)林地土壤释放CO2量(2 674.4 g·m-2)约为农田(1 285.3 g·m-2)的2倍;观测期间,农田土壤呼吸速率占林地的比例范围在23.4%~76.3%之间,说明土壤呼吸作用还受不同土地利用方式下植被类型等的影响。农田和红松针阔混交林土壤呼吸作用的Q10值分别为3.07和2.92,农田土壤呼吸作用的Q10 值估计可能偏大。森林转变为农田后,环境、生物因子以及土壤养分含量和物理性质发生改变,共同影响土壤呼吸作用的强度和动态特征。
王旭, 周广胜, 蒋延玲, 李峰. 长白山红松针阔混交林与开垦农田土壤呼吸作用比较. 植物生态学报, 2006, 30(6): 887-893. DOI: 10.17521/cjpe.2006.0112
WANG Xu, ZHOU Guang-Sheng, JIANG Yan-Ling, LI Feng. COMPARISON OF SOIL RESPIRATION IN BROAD-LEAVED KOREAN PINE FOREST AND RECLAIMED CROPLAND IN CHANGBAI MOUNTAINS, CHINA. Chinese Journal of Plant Ecology, 2006, 30(6): 887-893. DOI: 10.17521/cjpe.2006.0112
土地类型 Land type | 有机碳 Organic C (mg·g-1) | 全氮 Total N (mg·g-1) | 碳氮比 C∶N ratio | 容重 Bulk density (g·m-3) | 总孔隙度 Total porosity (%) | pH值 pH value | |||||
---|---|---|---|---|---|---|---|---|---|---|---|
红松针阔混交林 Korean pine forest | 125.6 | 10.6 | 11.9 | 0.64 | 75.9 | 4.9 | |||||
开垦农田 Cropland | 27.9 | 2.9 | 9.6 | 1.10 | 58.4 | 5.7 |
表1 各样地土壤理化性质
Table 1 Soil physicochemical characteristics of experimental plots
土地类型 Land type | 有机碳 Organic C (mg·g-1) | 全氮 Total N (mg·g-1) | 碳氮比 C∶N ratio | 容重 Bulk density (g·m-3) | 总孔隙度 Total porosity (%) | pH值 pH value | |||||
---|---|---|---|---|---|---|---|---|---|---|---|
红松针阔混交林 Korean pine forest | 125.6 | 10.6 | 11.9 | 0.64 | 75.9 | 4.9 | |||||
开垦农田 Cropland | 27.9 | 2.9 | 9.6 | 1.10 | 58.4 | 5.7 |
图1 红松针阔混交林和农田土壤呼吸(a)、土壤温度(b)和土壤含水量日变化(c)
Fig.1 Diurnal variations of soil respiration (a), soil temperature (b), soil water content (c) in broad-leaved Korean pine forest plot and cropland plot
土地利用类型 Land-use type | Ta | T0 | T5 | T10 | T15 | T20 |
---|---|---|---|---|---|---|
红松针阔混交林 Korean pine forest | 0.424 | 0.585 | 0.937* | 0.819 | 0.525 | 0.230 |
农田(玉米) Cropland (Maize) | 0.858 | 0.872 | 0.957* | 0.685 | 0.315 | 0.057 |
表2 红松针阔混交林和农田土壤呼吸作用速率与土壤温度的相关系数
Table 2 Correlative coefficients between soil respiration and soil temperature in Korean pine forest plot and cropland plot
土地利用类型 Land-use type | Ta | T0 | T5 | T10 | T15 | T20 |
---|---|---|---|---|---|---|
红松针阔混交林 Korean pine forest | 0.424 | 0.585 | 0.937* | 0.819 | 0.525 | 0.230 |
农田(玉米) Cropland (Maize) | 0.858 | 0.872 | 0.957* | 0.685 | 0.315 | 0.057 |
差异源 Source of variance | 平方和 Sum of squares | 自由度 Degree of freedom | 方差 Mean square | F值 F value | p值 p value |
---|---|---|---|---|---|
组间 Intergroup | 18.090 | 1 | 18.090 | 5.384 | 0.031 |
组内 Innergroup | 67.198 | 20 | 3.360 | ||
总计 Total | 85.288 | 21 |
表3 红松针阔混交林和农田土壤呼吸速率方差分析
Table 3 ANOVA analyses of soil respiration between broad-leaved Korea pine forest plot and cropland plot
差异源 Source of variance | 平方和 Sum of squares | 自由度 Degree of freedom | 方差 Mean square | F值 F value | p值 p value |
---|---|---|---|---|---|
组间 Intergroup | 18.090 | 1 | 18.090 | 5.384 | 0.031 |
组内 Innergroup | 67.198 | 20 | 3.360 | ||
总计 Total | 85.288 | 21 |
图3 土壤呼吸速率和土壤5 cm温度的关系
Fig.3 Relationship between soil respiration and soil temperature at 5 cm depth in broad-leaved Korea pine forest plot and cropland plot
图4 土壤呼吸与10 cm土壤水分体积含量的关系
Fig.4 Relationship between soil respiration and soil water volumetric content at 10 cm depth in broad-leaved Korea pine forest plot and cropland plot
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