摘要
为研究黄土高原水蚀风蚀交错带不同水分与密度处理的人工苜蓿和沙打旺草地土壤呼吸特征,分析了人工草地土壤呼吸对水分和密度的响应及其与环境因子的关系。结果表明:水分增加能够显著促进黄土高原水蚀风蚀交错带人工草地土壤呼吸速率(P<0.01),土壤呼吸对不同密度处理的响应特征因草地植被类型不同而异,土壤呼吸速率的季节变化对水分增加和密度响应不敏感。土壤水分是土壤呼吸的限制因子,土壤温度与土壤呼吸速率在6-7月份(旱季后期)相关性不明显,8月份后(雨季)相关性增强。土壤呼吸与表层土壤水分和温度有着显著的耦合关系,加水减弱了苜蓿草地土壤呼吸对水分和温度的依赖,而未改变沙打旺草地土壤呼吸对表层土壤水分和温度的依赖。
In this paper,soil respiration rate of Medicago sativa L and Astragalus adsurgens Pall grassland in wind-water erosion crisscross region on the Loess Plateau were measured to understand the response of soil respiration in vegetated grassland to water and plant density and to relate soil respiration with environmental factors.The results showed that water adding significantly accelerated soil respiration rate（P〈0.01）,while the response of soil respiration to plant density varied with plant species.The seasonal change of soil respiration was not affected by water and density treatments.Soil respiration was not significantly correlated with soil temperature in June and July（later dry seasons）,but significantly correlated with soil temperature in August（rain season）,suggesting that soil respiration in vegetated grassland was mainly limited by water.Soil respiration was significantly coupled with surface soil water and temperature,and thus depended on them.Adding water decreased the dependence of soil respiration on surface soil water and temperature in Medicago sativa L grassland rather than in Astragalus adsurgens Pall grassland.
出处
《水土保持学报》
CSCD
北大核心
2011年第4期207-211,216,共6页
Journal of Soil and Water Conservation
基金
国家自然科学基金(40801111)
国家重点基础研究发展规划(2007CB106803)
陕西省科学技术研究发展计划项目(2011kjxx25)
西北农林科技大学青年学术骨干支持计划
关键词
水蚀风蚀交错带
水分
密度
土壤呼吸
水温耦合
人工草地
wind-water erosion crisscross region
water
density
soil respiration
soil water and temperature coupling
vegetated grassland
