干旱区生态环境知识资源中心(Arid): 川西北沙化草地植被群落、土壤有机碳及微生物特征

Arid

	川西北沙化草地植被群落、土壤有机碳及微生物特征
其他题名	Plant community characteristics, soil organic carbon and soil biological properties of grassland desertification sites in Northwest Sichuan
	舒向阳 1; 胡玉福 1; 蒋双龙 2; 马畅 1; 李一丁 1; 蒲琴 1; 王倩 1
来源期刊	草业学报
ISSN	1004-5759
出版年	2016
卷号	25 期号:4 页码:45-54
中文摘要	为探究川西北高寒沙化草地地表植被、土壤有机碳和微生物的特征,采用样地调查方法,研究了不同沙化程度草地地表植被状况及土壤有机碳、腐殖质碳、微生物数量和微生物量碳、氮的差异特征。结果表明,1)随沙化严重程度增加,植被群落盖度、植被地上和地下生物量急剧下降。与未沙化草地相比,轻度沙化、中度沙化、重度沙化和极重度沙化草地地上生物量分别降低了12.95%,40.60%,76.53%和91.78%,地下生物量分别降低了21.44%,44.00%,83.41%和94.65%。2)土壤有机碳、腐殖质碳组分均随着沙化程度的提高而呈下降的趋势,且0~20 cm土层变化最为显著。不同沙化草地各土层之间也存在差异,但重度和极重度沙化草地各土层之间没有显著差异。3)随着沙化程度的加剧,土壤微生物(细菌、真菌、放线菌)数量和微生物量碳、氮产生显著变化。土壤沙化加剧会导致土壤微生物数量、微生物量碳、氮含量显著降低,破坏土壤微生物群落结构。
英文摘要	Changes in surface vegetation cover, soil organic carbon and soil microorganisms associated with alpine grassland desertification in Northwest Sichuan were explored. We studied the surface vegetation cover, aboveground and underground biomass and the vertical distribution of soil organic carbon and microorganisms in different grassland on sandy soils using repeated sampling. The results showed that with aggravation of desertification, vegetation cover and aboveground and underground biomass decreased sharply. Compared with grassland not undergoing desertification, aboveground biomass of grassland suffering mild, medium, heavy and severe desertification was decreased by 13.0%, 91.8%, 76.5% and 40.6% respectively. Underground biomass decreased by 21.4%, 44.0%, 83.4% and 94.7% respectively. With the increase of the degree of desertification, soil organic carbon and humus carbon fractions showed a declining trend, most obvious in the 0-20 cm soil layer. There were differences among different soil layers but there were no differences between grassland undergoing heavy and severe desertification. The degree of desertification also influenced the number of soil microorganisms (bacteria, fungi, actinomycetes) and microbial biomass carbon and nitrogen; desertification reduced all of these soil traits.
中文关键词	草地沙化 ; 植被群落 ; 有机碳 ; 微生物
英文关键词	grassland desertification vegetation community soil organic carbon microorganism
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5682900
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234008
作者单位	1.四川农业大学资源学院, 成都, 四川 611130, 中国; 2.开江县国土资源局, 达州, 四川 636250, 中国
推荐引用方式 GB/T 7714	舒向阳,胡玉福,蒋双龙,等. 川西北沙化草地植被群落、土壤有机碳及微生物特征[J],2016,25(4):45-54.
APA	舒向阳.,胡玉福.,蒋双龙.,马畅.,李一丁.,...&王倩.(2016).川西北沙化草地植被群落、土壤有机碳及微生物特征.草业学报,25(4),45-54.
MLA	舒向阳,et al."川西北沙化草地植被群落、土壤有机碳及微生物特征".草业学报 25.4(2016):45-54.