环境因子对暗沃寒冻雏形土土壤CO2释放速率的影响

doi:10.11733/j.issn.1007-0435.2001.04.013

›› 2001, Vol. 9 ›› Issue (4): 307-312.DOI: 10.11733/j.issn.1007-0435.2001.04.013

环境因子对暗沃寒冻雏形土土壤CO₂释放速率的影响

曹广民, 李英年, 张金霞, 赵新全

中国科学院西北高原生物研究所, 西宁, 810001

收稿日期:2001-05-31 修回日期:2001-09-20 出版日期:2001-11-15 发布日期:2001-11-15
作者简介:曹广民(1963- ),男,汉族,副研究员,主要从事草地生态系统物质循环方面研究工作,已发表论文30余篇
基金资助:
国家重点基础研究专项经费(G1998040800);中国科学院知识创新工程项目(KSCX2-1-07);国家自然科学基金(30074147);中国科学院海北高寒草甸生态系统定位站基金资助

Effect of Soil Circumstances Biogeochemical Factors on Carbon Dioxide Emission from Mollic-Gryic Cambisols

CAO Guang-min, LI Ying-nian, ZHANG Jin-xia, ZHAO Xin-quan

The Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810001, China

Received:2001-05-31 Revised:2001-09-20 Online:2001-11-15 Published:2001-11-15

摘要/Abstract

摘要： 暗沃寒冻雏形土土壤CO₂释放的日变化与气温及地表温度的日变化过程同步,只是气温日变化峰值推迟了2h。地表温度与土壤CO₂释放速率呈极显著正相关。暗沃寒冻雏形土土壤CO₂释入的季节动态受土壤温度(0～30cm,特别是10cm)、真菌菌丝生物量(0～20cm)、土壤有机碳现存量(0～20cm)和生物量的影响。它们均与土壤CO₂的释放速率呈显著或极显著的正相关关系。过度放牧使土壤容重增大,孔隙度和土壤有机碳贮量减小,从而降低土壤CO₂释放速率,方差分析结果表明,差异显著。而土壤湿度及降雨对土壤CO₂释放速率影响较小。

关键词: 暗沃寒冻雏形土, CO₂释放速率, 高寒灌丛

Abstract: Soil CO₂ emission is the production of microbial decomposition of soil organic substances and respiration of plant roots, which is effected by soil biotic and environmental factors. Daily changes in soil CO₂ emission from Mollic-gryic Cambisols was paralleled with daily trends of air temperature and soil surface temperature,but the peak of air temperature delay 2 hours than that of soil CO₂ emission and soil surface temperature. Soil surface temperature had strong effect on CO₂ emission and both exhibited a highly significant relationship. However, that were became weak at 5 cm undergroud. Soil temperature (at 0～30 cm, especially 5 cm), fungal hyphal biomas (within 0～20 cm), humic-c extant (within 0～20 cm) and live extant of aboveground cause seasonal variation of soil CO₂ emission and all exhibited a significant or extremely significant level to soil CO₂ emision. Over grazing made the rising of soil capacity and the decrease of porosity and organic substance, they can reduce soil CO₂ emission. The difference in CO₂ emission, stocking intensities were separately 2.55 and 5.35 sheeps/km-2 was significantly by F-test. Precipitation and soil moisture has not affected soil CO₂ emission from Mollic-gryic Cambisols. Sudden climate change would lead to strong fluctuation soil CO₂ emission.

Key words: Mollic Gryic cambisols, CO₂ emission, Alpine shrub

中图分类号:

S154.1

曹广民, 李英年, 张金霞, 赵新全. 环境因子对暗沃寒冻雏形土土壤CO₂释放速率的影响[J]. , 2001, 9(4): 307-312.

CAO Guang-min, LI Ying-nian, ZHANG Jin-xia, ZHAO Xin-quan. Effect of Soil Circumstances Biogeochemical Factors on Carbon Dioxide Emission from Mollic-Gryic Cambisols[J]. , 2001, 9(4): 307-312.

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环境因子对暗沃寒冻雏形土土壤CO₂释放速率的影响

Effect of Soil Circumstances Biogeochemical Factors on Carbon Dioxide Emission from Mollic-Gryic Cambisols

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