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半干旱区土壤微生物呼吸对极端降水的响应
赵慢1; 王蕊1; 李如剑3; 杜兰兰3; 吴得峰1
2016
Source Publication环境科学
Volume37Issue:7Pages:2714-2720
Abstract

了解土壤微生物呼吸对极端降水的响应对深入理解全球变暖趋势下降水格局的改变对土壤碳循环的影响具有重要意
义. 于2015 年雨季( 7 ~ 9 月) 在长武农田生态系统国家野外站,模拟了3 种雨季降水量( 最高600 mm; 平均300 mm; 最低
150 mm) 条件下两种降水形式( 每次10 mm: P10
,每次150 mm: P150
) . 利用土壤碳通量测量系统( Li-COR,Lincoln,NE,USA)
监测不同降水条件下土壤微生物呼吸速率及其土壤水分、温度的变化. 相同次降水量条件下,土壤微生物呼吸波动因雨季降
水量变化而不同. P150
较P10
波动剧烈, 600 mm 降水量下土壤微生物呼吸变异系数分别为36% 和33%; 300 mm 降水量下为
28%和22%, 150 mm 降水量下依次为43%和29%. 与P10
相比,P150
土壤微生物呼吸累积量在600 mm 降水量下降低20%; 但
150 mm 降水量下增加22%, 300 mm 降水量下二者无显著差异. 土壤累积呼吸量与水分胁迫时间长短呈显著负相关( R2 =
0. 75) . 全球变暖趋势下极端性降水事件增加对土壤微生物呼吸的影响不容忽视.

Other Abstract

Evaluating the response of soil microbial respiration to extreme precipitation event is significant for a better understanding
about the influence of the change of precipitation regime on soil carbon cycling under global warming. A simulated experiment of
extreme precipitations was conducted during the rainy season ( July-September 2015 ) in the Changwu State Key Agro-Ecological
Station,Shaanxi,China. The treatments consisted of three total precipitations in rainy season ( 600 mm,300 mm,and 150 mm) and
two precipitation regimes ( 10 mm,150 mm; P10
,P150
) . Soil microbial respiration varied differently in the same single rainfall event
among three precipitations. The variation coefficient of soil microbial respiration under 600 mm total precipitation was 36% ( P150
) and
33% ( P10
) ,and 28% and 22% under 300 mm total precipitation,43% and 29% under 150 mm total precipitation. Under 600 mm
total precipitation,the cumulative soil microbial respiration under P150 was 20% less than that under P10
; however,the cumulative soil
respiration of P150 under 150 mm total precipitation was 22% more than that under P10
; and there was no significant difference between
P10 and P150 under 300 mm total precipitation. Therefore,the duration in soil water stress must be considered to estimate soil microbial
respirations under extreme precipitations.

Keyword极端降水 降水形式 土壤微生物呼吸 土壤水分 水分胁迫
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8715
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学资源与环境学院
2.中国科学院水利部水土保持研究所
3.西北农林科技大学水土保持研究所
Recommended Citation
GB/T 7714
赵慢,王蕊,李如剑,等. 半干旱区土壤微生物呼吸对极端降水的响应[J]. 环境科学,2016,37(7):2714-2720.
APA 赵慢,王蕊,李如剑,杜兰兰,&吴得峰.(2016).半干旱区土壤微生物呼吸对极端降水的响应.环境科学,37(7),2714-2720.
MLA 赵慢,et al."半干旱区土壤微生物呼吸对极端降水的响应".环境科学 37.7(2016):2714-2720.
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