The direct and indirect effects of land use and water quality on phytoplankton communities in an agriculture-dominated basin

	The direct and indirect effects of land use and water quality on phytoplankton communities in an agriculture-dominated basin
	Zhang, Zhiming; Gao, Junfeng; Cai, Yongjiu
刊名	ENVIRONMENTAL MONITORING AND ASSESSMENT
	2020
卷号	192 期号:12
英文摘要	Understanding the factors that control biodiversity in rivers is challenging due to the variety of potential sources, linkages, and processes. This research assesses the effects of land use on phytoplankton communities across water quality gradients. By employing abiotic and biotic datasets of 149 catchments in Lake Chaohu basin, China, and a structural equation model (SEM), the direct and indirect effects of land use and water quality on phytoplankton dynamic were analyzed. Both land use and water quality had statistically significant direct effects on phytoplankton community attribute and diversity, although these effects differed among these indices. For instance, farmland was found to positively affect the abundance and diversity indices, while total nitrogen (TN) had significant positive effects on species richness and abundance. Importantly, the average indirect effects strengthened the effects of land use (e.g., built-up land and woodland) up to 82.4% mainly through nutrients, while the average indirect effects weakened the effects of land use (e.g., farmland) by as much as 49.9% mainly due to nutrients, thus indicating the prevailing role of the effects of land use on phytoplankton based on nutrient concentrations. The results suggest that nutrients can regulate the effect of land use on phytoplankton community attribute and diversity indices. This study highlights the advantages of using an SEM because the potential linkages for phytoplankton diversities are more likely to be identified with this method than with a classical linear regression model. Therefore, SEM has wide application prospects in the field of the conservation of biodiversity in freshwater rivers.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/19911]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Zhang, Zhiming,Gao, Junfeng,Cai, Yongjiu. The direct and indirect effects of land use and water quality on phytoplankton communities in an agriculture-dominated basin[J]. ENVIRONMENTAL MONITORING AND ASSESSMENT,2020,192(12).
APA	Zhang, Zhiming,Gao, Junfeng,&Cai, Yongjiu.(2020).The direct and indirect effects of land use and water quality on phytoplankton communities in an agriculture-dominated basin.ENVIRONMENTAL MONITORING AND ASSESSMENT,192(12).
MLA	Zhang, Zhiming,et al."The direct and indirect effects of land use and water quality on phytoplankton communities in an agriculture-dominated basin".ENVIRONMENTAL MONITORING AND ASSESSMENT 192.12(2020).