太湖食物网生态化学计量学特征空间差异

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Abstract Environmental samples (water and SOM) and biological samples were collected from the algae-dominated zone and macrophyte-dominated zone, respectively, in Lake Taihu. The content and ratio of TOC, TN and TP of environmental samples and biological samples of these two lake zones were analyzed to explore the spatial differences within ecological stoichiometric characteristics of Lake Taihu food web. Results show that, the elemental carbon, nitrogen and phosphorus contents of the environmental samples in the algae-dominant zone were higher than those of the macrophyte-dominated zone. Furthermore, there were significant differences within environmental TOC, TN and TP, except for the TOC and TN of SOM. The elemental content was stable for species in the higher trophic levels between these two lake zones. The C:N, C:P and N:P ratios of environmental samples in the algae-dominated zone were lower than that in the macrophyte-dominated zone; however, only the C:P and C:N of SOM in these two lake zones showed significant differences (P<0.05). In addition, groups in the lower trophic levels of the food web showed more variability of element ratios within the two lake zones. Thus, a stoichiometric imbalance exists in the food webs of both lake zones. These spatial differences may be related to different pollution inputs for these two lake zones. Furthermore, the relatively stable element content and ratio of the species at the higher trophic levels reflect the stoichiometric homeostasis within food web.

Key words： ecological stoichiometric characteristics shallow lakes ecosystem spatial heterogeneity carbon nitrogen and phosphorus

Received: 10 May 2017

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	Articles by authors
	XU De-lin
	LIN Nai-feng
	ZOU Chang-xin
	WANG Yan
	WU Dan
	CAI Yin
	AN Shu-qing

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XU De-lin,LIN Nai-feng,ZOU Chang-xin等. The spatial differences analysis of ecological stoichiometric characteristics of Lake Taihu food web[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(12): 4681-4689.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I12/4681

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