模拟降水和不同载畜率对荒漠草原生态系统碳交换的影响

doi:10.12160/j.issn.1672-5190.2021.06.010

Abstract

Abstract: [Objective] To see how varied precipitation gradients and stocking rates affect ecosystem carbon exchange. [Method] In the Stipa breviflora desert steppe in Siziwang Banner, Ulanqab City, Inner Mongolia, the experiment incorporated a simulated precipitation test （50% precipitation reduction, natural precipitation, 50% precipitation increase and 100% precipitation increase） to the platform of varied stocking rates （CK, low stocking rate, moderate stocking rate, and high stocking rate). During the plant growing season in the year of 2017, the Li-6400 portable photosynthetic instrument and closed box method were used to measure the responses of net ecosystem carbon exchange （NEE）, ecosystem respiration （ER）, and gross ecosystem productivity （GEP） to different precipitation gradients and stocking rates. [Result] ① Precipitation alone had significant （P<0.001) effect on NEE, ER and GEP. ②ER in the high stocking rate treatment group was significantly （P<0.05） lower than that in CK. ③Interaction of precipitation and stocking rate had a statistically significant （P<0.05） influence on GEP only. Under the same stocking rate, NEE, ER, and GEP increased with precipitation increase. With the same precipitation rate, ER and GEP in CK were significantly （P<0.05) higher than those in the high stocking rate treatment group. Under the low stocking rate, the absolute value of slope in the established linear regression model among ER, GEP and Vwc was the highest. [Conclusion] NEE, ER, and GEP all increased significantly as soil water content increased. ER decreased significantly as stocking rate increased. The interaction between precipitation and stocking rate only had a significant impact on GEP. Although increased water facilitated ecosystem carbon exchange, under moderate and high stocking rates, the desert steppe ecosystem carbon exchange had reduced sensitivity to the change of soil water content.

Key words: precipitation, stocking rate, net ecosystem carbon exchange, ecosystem respiration flux, gross ecosystem productivity

CLC Number:

S812.8

CUI Yuan-yuan, BAI Liu, WANG Zi-han, ZHAO Hong-yu, Baoyinhexige, LI Zhi-guo, HAN Guo-dong, WANG Zhong-wu. Effects of Simulated Precipitation and Different Stocking Rates on Carbon Exchange in Desert Steppe Ecosystem[J]. Animal Husbandry and Feed Science, 2021, 42(6): 50-55.

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Effects of Simulated Precipitation and Different Stocking Rates on Carbon Exchange in Desert Steppe Ecosystem

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