干旱区生态环境知识资源中心(Arid): 乌梁素海芦苇枯落物分解动态及营养元素释放研究

Arid

	乌梁素海芦苇枯落物分解动态及营养元素释放研究
其他题名	On the decomposition dynamics and nutrient release of Phragmites australis litter in Wuliangsu Lake
	魏江明 1; 王立新 1; 刘东伟 1; 刘华民 2; 清华 1; 王炜 2; 梁存柱 3
来源期刊	安全与环境学报
ISSN	1009-6094
出版年	2016
卷号	16 期号:5 页码:364-370
中文摘要	乌梁素海是内蒙古高原干旱区最典型的浅水草型湖泊,湖滨带芦苇分布广袤,其收割方式是在冬季湖泊结冰后将冰面上芦苇收割,冰面下芦苇则留存在水中,而水下部分的分解是造成湖泊生物淤积的重要原因,且分解过程中营养元素的释放亦加剧了湖泊富营养化。通过分解袋法研究了湖泊水面下芦苇枯落物的分解动态及营养元素的释放过程,并探讨了芦苇枯落物分解的影响因素。结果表明:1)芦苇枯落物分解270 d后质量残留率为52.44%,分解速率常数为0.002 68 d~(-1),其分解50%需要0.83 a,分解95%需要3.19 a;2)芦苇枯落物分解过程中,N元素的分解状态呈现释放-分解-再释放的规律,P元素和C元素均处于持续释放的分解状态;3)芦苇枯落物分解期间,分解速率和营养元素含量动态受枯落物自身质量和环境因子共同影响,且环境因子(温度、溶解氧、pH值)与芦苇枯落物分解速率及元素释放动态相关性显著。研究表明,芦苇枯落物分解释放大量营养物质,对湖泊富营养化有一定的贡献,要进一步加强芦苇植物的收割以减轻植物腐烂分解对湖泊造成的二次污染,减少生物淤积作用。
英文摘要	This paper intends to bring about an estimate of the decomposition rate and the nutrient dynamics of Phragmites australis litters with a discussion of the influential factors via the litterbags technique in Wuliangsu Lake, one of the most typical shallow lakes in the arid zone in Inner Mongolia plateau. As is known, the common reed, Phragmites australis (Cav.) Trin. ex Steudel has been widely scattering along the banks and open shallow water areas of the said lake surroundings, which is usually harvested in the early winter days when the ice has been formed on the lake surface. Nevertheless, there still remain lots of reed litters scattering under the lake-water surface when the reed is harvested, thus resulting in the problem of litter deposition and nutrients release into the water column and sediments, which is likely to speed up the eutrophication of the reeds. The detailed results of our study can be found as follows: (1) The decomposed litter tends to be quickly disappearing with only 52.44% of the dry mass remaining till the end of our experiment, which may last as long as a period of 270 d at a decomposing speed of 0.002 68 d~(-1). And, correspondingly, 0.83 of a year is needed for a decomposition rate of 50% of the dry mass decomposition, whereas 3.19 a is needed for a decomposition rate of 95%. And, (2) a conclusion that has been proposed by the authors of the paper is that, in the process of decomposition, N in the litter is supposed to be the dynamics characteristics of the release-accumulation-release process, while P and C are supposed to be a release state in the process of the decomposition. (3) In the process of decomposition, the decomposition rate and the nutritional content are supposed to change simultaneously due to the effects of the quality of the litter and the environmental factors, too, such as the water temperature, the dissolved oxygen and pH value. And, thus, it can be concluded that the decomposition of Phragmites australis litter provides a short-term sink for the available nutrients in aquatic ecosystems and then tends to be accumulated in the sediment. Thus, we would like to recommend to harvest the ripening reed and remove it at the end of the growing season timely so as to get rid of nutrient leaching by the left-over matter parts remaining in the water environment.
中文关键词	环境科学技术基础学科 ; 枯落物分解 ; N元素 ; P元素 ; 生物淤积 ; 乌梁素海 ; 芦苇
英文关键词	basic disciplines of environmental science and technology litter decomposition nitrogen element phosphorus element biological sedimentation Wuliangsu Lake Phragmites australis (Cav.) Trin. ex Steudel
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5839221
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233897
作者单位	1.内蒙古大学环境与资源学院, 呼和浩特, 内蒙古 010021, 中国; 2.内蒙古大学生命科学学院, 呼和浩特, 内蒙古 010021, 中国; 3.中美生态、能源及可持续性科学内蒙古研究中心, 呼和浩特, 内蒙古 010021, 中国
推荐引用方式 GB/T 7714	魏江明,王立新,刘东伟,等. 乌梁素海芦苇枯落物分解动态及营养元素释放研究[J],2016,16(5):364-370.
APA	魏江明.,王立新.,刘东伟.,刘华民.,清华.,...&梁存柱.(2016).乌梁素海芦苇枯落物分解动态及营养元素释放研究.安全与环境学报,16(5),364-370.
MLA	魏江明,et al."乌梁素海芦苇枯落物分解动态及营养元素释放研究".安全与环境学报 16.5(2016):364-370.