Effects of grazing on photosynthetic features and soil respiration of rangelands in the Tianshan Mountains of Northwest China.

Abstract:

:Rangelands play a critical role in the global carbon cycle. However, the eco-physiological mechanisms associated with the effects of grazing on leaf photosynthesis and soil respiration remain poorly understood. To examine the impacts of grazing on leaf photosynthesis and soil respiration, we measured the photosynthetic parameters of the dominant species (Trifolium repens) and the soil respiration in grazed and ungrazed rangelands in the Tianshan Mountains of China. We found that grazing reduced the daily maximum net photosynthetic rate and soil respiration rates by 35% and 15%, respectively. The photosynthetic quantum yield, dark respiratory rate, and water use efficiency of T. repens leaves were reduced in grazed plots by 33.3%, 69.2%, and 21.5%, respectively. Our results demonstrated that grazing reduced carbon assimilation while increasing soil respiration within the rangelands in the Tianshan Mountains.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Liu H,Zang R,Chen HY

doi

10.1038/srep30087

subject

Has Abstract

pub_date

2016-07-25 00:00:00

pages

30087

issn

2045-2322

pii

srep30087

journal_volume

6

pub_type

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