摘要
以科尔沁沙丘-草甸相间地区为研究区,运用LI-6400土壤呼吸配套系统对沙丘-草甸过渡带人工杨树林和固定沙丘小叶锦鸡儿群落土壤呼吸及其相关因子进行观测,结果表明,(1)生长期和生长末期人工杨树林保留和去除枯枝落叶土壤呼吸的日变化表现为"多峰型"。(2)人工杨树林和小叶锦鸡儿群落保留和去除枯枝落叶土壤呼吸的季变化峰值均出现在8月份,人工杨树林的土壤呼吸明显大于小叶锦鸡儿群落的土壤呼吸。(3)人工杨树林土壤呼吸的季变化与0—10cm土壤温度相关显著(P<0.01),保留枯枝落叶土壤呼吸小于去除枯枝落叶。(4)小叶锦鸡儿群落土壤呼吸的季变化与0—10cm土壤含水量相关显著(P<0.01),与人工杨树林不同,保留枯枝落叶土壤呼吸大于去除枯枝落叶。(5)人工杨树林土壤呼吸与土壤温度显著呈指数关系,小叶锦鸡儿群落土壤呼吸与土壤含水量显著呈幂函数关系,并运用归一化法,通过建立土壤呼吸LnRs与土壤温度T、土壤含水量Lnθ的双因子回归模型,得出土壤温度和土壤含水量分别对保留和去除枯枝落叶土壤呼吸的贡献率。
The soil respiration and related correlation factors of an artificial poplar forest in the Horqin Sandy Land-meadow transitional zone and a Caragana microphylla community in a fixed dune were observed in this study using the LI-6400 soil- respiration supporting system. Results demonstrated the following five phenomena. （1） Daily changes in reserved and removed litter from the artificial poplar forest during the growth and late-growth periods have multiple peaks. （2） Seasonal peaks of reserved litter and removed litter appear in August for the artificial poplar forest and the C. rnicrophyUa community. Soil respiration of the artificial poplar forest is much higher than that of the C. microphylla community. （3） Seasonal changes of soil respiration in the artificial poplar forest are significantly correlated with the soil temperature （0-10 cm from the surface） （P〈0.01）. Changes in the reserved litter are smaller than changes in the removed litter. （4） Seasonal changes of soil respiration of the C. microphylla community are significantly correlated with soil moisture content （0-10 cm from the surface） （P〈0.01）. Unlike soil from the artificial poplar forest, changes in the reserved litter are larger than those in the removed litter. （5） The soil respiration of the artificial poplar forest is exponentially correlated with soil temperature, whereas soil respiration of the C. microphylla community has a significant power function relationship with the soil moisture content. By establishing a two-factor regression model of soil respiration content （In θ）, contributions of soil temperature and soil moisture determined using the normalization method. （ In Rs） versus soil temperature （T） and soil water content to reserved litter and removed litter were
出处
《生态学报》
CAS
CSCD
北大核心
2017年第6期1994-2004,共11页
Acta Ecologica Sinica
基金
国家自然科学基金重点与面上资助项目(51139002
51479086)
内蒙古水利科技项目
教育部科技创新团队发展计划(IRT13069)
内蒙古自治区草原英才产业创新创业人才团队
内蒙古农业大学寒旱区水资源利用创新团队(NDTD2010-6)资助
