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

畜牧与饲料科学 ›› 2021, Vol. 42 ›› Issue (6): 50-55.doi: 10.12160/j.issn.1672-5190.2021.06.010

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

崔媛媛¹, 白柳¹, 王梓晗¹, 赵宏宇¹, 宝音贺西格², 李治国¹, 韩国栋¹, 王忠武¹

1.内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特 010011;
2.内蒙古自治区农牧业科学院,内蒙古呼和浩特 010031

收稿日期:2021-08-02 出版日期:2021-11-30 发布日期:2022-01-10
通讯作者: 王忠武（1979—）,男,教授,博士,主要研究方向为草地生态与管理。
作者简介:崔媛媛（1996—）,女,硕士研究生,主要研究方向为草地生态与管理。
基金资助:
国家重点研发计划项目（2016YFC0500504）; 内蒙古自治区重大科技专项（ZDZX2018020）; 国家自然科学基金项目（31560140,31760143）; 内蒙古自治区科技成果转化项目（2019CG069,2020C

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

CUI Yuan-yuan¹, BAI Liu¹, WANG Zi-han¹, ZHAO Hong-yu¹, Baoyinhexige², LI Zhi-guo¹, HAN Guo-dong¹, WANG Zhong-wu¹

1. College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Hohhot 010011,China;
2. Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China

Received:2021-08-02 Online:2021-11-30 Published:2022-01-10

摘要/Abstract

摘要： [目的] 探究不同降水梯度和不同载畜率对生态系统碳交换的影响。[方法] 试验依托内蒙古乌兰察布市四子王旗短花针茅荒漠草原不同载畜率（对照、低载畜率、中载畜率、高载畜率）平台,增设模拟降水试验（减水50%、自然降水、增水50%、增水100%）。在2017年植物生长季,采用Li-6400便携式光合仪和密闭式箱法测定生态系统净碳交换（net ecosystem carbon exchange,NEE）、生态系统呼吸（ecosystem respiration,ER）和生态系统总初级生产力（gross ecosystem productivity,GEP）对不同降水梯度和不同载畜率的响应。[结果] ①降水单因素处理对NEE、ER、GEP均产生极显著（P<0.001）影响。②高载畜率处理的ER显著（P<0.05）低于对照处理。③降水与载畜率的交互作用只对GEP产生显著（P<0.05）影响。相同载畜率处理下,降水量的增加对NEE、ER、GEP均有促进作用;相同降水处理下,对照区的ER、GEP显著（P<0.05）高于高载畜率区。ER、GEP在低载畜率条件下与土壤体积含水量的线性回归模型斜率的绝对值最大。[结论] 随着土壤含水量的增加,NEE、ER、GEP呈显著增加的趋势;随着载畜率的增加,ER显著降低,降水与载畜率的交互作用只对GEP产生显著影响,尽管水分的增加促进生态系统碳交换,但中、高载畜率条件下荒漠草原生态系统碳交换对土壤水分变化的敏感性减少。

关键词: 降水, 载畜率, 生态系统净碳交换, 生态系统呼吸通量, 生态系统总初级生产力

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

中图分类号:

S812.8

崔媛媛, 白柳, 王梓晗, 赵宏宇, 宝音贺西格, 李治国, 韩国栋, 王忠武. 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[J]. 畜牧与饲料科学, 2021, 42(6): 50-55.

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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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

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

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