环境因子对农业土壤有机碳分解的影响

应用生态学报 ›› 2002, Vol. ›› Issue (6): 709-714.

环境因子对农业土壤有机碳分解的影响

黄耀, 刘世梁, 沈其荣, 宗良纲

南京农业大学资源与环境科学学院, 南京 210095

收稿日期:2000-04-29 修回日期:2000-08-27 出版日期:2002-06-15
通讯作者: 黄耀,男,1956年生,获美国莱斯大学生态与进化生物学系哲学博士,教授,博士导师.主要从事农田温室气体与全球变化及生态系统模拟方面的研究,发表论文50余篇.Tel:025-4396406,E-mail:huangy@njau.edu.cn
基金资助:
国家自然科学基金重点资助项目(39830220)

Influence of environmental factors on the decomposition of organic carbon in agricultural soils

HUANG Yao, LIU Shiliang, SHEN Qirong, ZONG Lianggang

College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095

Received:2000-04-29 Revised:2000-08-27 Online:2002-06-15

摘要/Abstract

摘要： 为研究环境因子对有机C在农业土壤中分解的影响,在不同温度、水分及土壤质地下进行小麦和水稻秸秆及其根培养实验,结果表明,在同样的水热条件下,秸秆有机C的分解量大于根的分解量.在温度较低情况下,升高温度促进了有机C的分解;而在温度较高的情况下,升高温度对有机C分解的促进作用降低.在非淹水条件下,温度对有机C分解的影响随着时间的延长而逐步减小.淹水条件下培养一周后,温度对有机C分解的影响不随时间而变化.当含水量为300g·kg^-1和500g·kg^-1时,有机C分解较快,而在200g·kg^-1和淹水条件下则分解较慢,空白对照培养结果的趋势是分解速率随水分含量的增加而加快.培养实验的第一个月内,小麦秸秆有机C的分解量与土壤粘粒含量呈负相关.

Abstract: To quantitatively investigate the effects of environmental factors on organic carbon decomposition,CO₂-Cwas measured from the incubation of wheat and rice straw as well as their roots mixed with a paddy soil over a 90-day period. Results showed that decomposition of the straw carbon was faster than that of the roots. Amount of CO₂-Creleased from the organic matter decomposition was quantitatively related to its properties of C/Nratio. Increase of temperature within a lower temperature range enhanced greatly the decomposition while such an enhancement weakened within a higher temperature range. Under the moist condition,the temperature coefficient of organic carbon decomposition declined exponentially with the incubation time. The temperature coefficient did not significantly decrease with the time for the submerged condition after one-week incubation. The effect of water status showed that the decomposition at the water contents of 300g穔g^-1 and 500g穔g^-1 was faster than that under the treatments of 200g穔g^-1 and the submerged. Within the first month period of incubation,carbon amount released from the incubation of wheat straw was negatively related to the clay fraction of the soils.

中图分类号:

S153.621

黄耀, 刘世梁, 沈其荣, 宗良纲. 环境因子对农业土壤有机碳分解的影响[J]. 应用生态学报, 2002, (6): 709-714.

HUANG Yao, LIU Shiliang, SHEN Qirong, ZONG Lianggang . Influence of environmental factors on the decomposition of organic carbon in agricultural soils[J]. Chinese Journal of Applied Ecology, 2002, (6): 709-714.

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