干旱区生态环境知识资源中心(Arid): 荒漠植物凋落物光降解特征随降水梯度的变化

Arid

	荒漠植物凋落物光降解特征随降水梯度的变化
其他题名	Photodegradation of plant litter in a temperate desert along a precipitation gradient
	黄刚; 周丽; 唐立松; 李彦; 赵红梅
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2013
卷号	32 期号:10 页码:2574-2582
中文摘要	为估算光降解在中亚干旱区地表凋落物分解中的作用,本研究利用凋落物分解袋法,以梭梭叶、芦苇叶和麦秆为研究对象,沿自然降水梯度,在古尔班通古特沙漠腹地、沙漠边缘和吐鲁番进行遮除紫外辐射和自然光照处理的分解试验。结果表明:1)紫外遮除处理降低了3个分解点的凋落物分解速率,但光降解对分解贡献率变化和分解点干燥程度的变化并不一致;2)紫外遮除处理降低了各分解点的凋落物氮素释放。凋落物分解过程中的氮释放动态因凋落物类型而异,芦苇和梭梭叶分解中的氮素变化在各分解点均表现为释放-累积-释放的变化过程,而麦秆则表现为释放-累积的过程;3)紫外遮除处理降低了半纤维素损失,对纤维素没有显著影响,木质素在分解过程中的变化对处理没有响应。本研究表明,光降解在温带荒漠区凋落物分解中起着重要的作用,其作用强度受分解点环境和凋落物质量的影响。
英文摘要	To estimate the effects of photodegradation on the decomposition of plant litter in arid areas of central Asia, three types of litter (Haloxylon ammodendron, Phragmites australis leaves and Triticum aestivum straw) were selected as test objects, and by using litterbag method, a decomposition experiment with UV exclusion and natural light was conducted along a precipitation gradient in the hinterland and southern periphery of Gurbantonggut Desert and the Turpan, Xinjiang of Northwest China. At the three sites, UV exclusion decreased the litter decomposition rate, but the contribution of photodegradation magnitude to the litter decomposition differed because of the different drought extent. UV exclusion reduced the N release from the litter, and the N release dynamics differed with litter type. H. ammodendron and P. australis leaves exhibited N release-accumulation-release pattern, while T. aestivum straw showed N release-accumulation pattern. UV exclusion reduced the litters hemicellulose loss, but had little effects on the litters cellulose and lignin contents. Our study suggested that photodegradation played an important role in the litter decomposition in temperate deserts, and the effect magnitude was dependent on the specific environmental condition and litter quality.
中文关键词	C组分损失 ; 关键C∶N ; 荒漠生态系统 ; 凋落物分解 ; N动态 ; 紫外辐射
英文关键词	carbon fraction loss critical C∶N desert ecosystem litter decomposition nitrogen dynamics UV radiation
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:4953302
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230075
作者单位	中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	黄刚,周丽,唐立松,等. 荒漠植物凋落物光降解特征随降水梯度的变化[J]. 中国科学院新疆生态与地理研究所,2013,32(10):2574-2582.
APA	黄刚,周丽,唐立松,李彦,&赵红梅.(2013).荒漠植物凋落物光降解特征随降水梯度的变化.生态学杂志,32(10),2574-2582.
MLA	黄刚,et al."荒漠植物凋落物光降解特征随降水梯度的变化".生态学杂志 32.10(2013):2574-2582.