氮和水分添加对内蒙古荒漠草原放牧生态系统土壤呼吸的影响

温超,单玉梅,晔薷罕,张璞进,木兰,常虹,任婷婷,陈世苹,白永飞,黄建辉,孙海莲

Effects of nitrogen and water addition on soil respiration in a Nei Mongol desert steppe with different intensities of grazing history

WEN Chao,SHAN Yu-Mei,YE Ru-Han,ZHANG Pu-Jin,MU Lan,CHANG Hong,REN Ting-Ting,CHEN Shi-Ping,BAI Yong-Fei,HUANG Jian-Hui,SUN Hai-Lian

表1 2015-2017年不同月份(M)、放牧强度(GI)、加水(W)、加氮(N)对内蒙古荒漠草原生长季土壤温度(ST)、土壤含水量(SM)、土壤呼吸速率(SR)影响的四因素方差分析结果

Table 1 Results (F-value) of four-way ANOVA on the effects of month (M), grazing intensity (GI), water (W), nitrogen addition (N) and their interactions on growing season soil temperature (ST), soil moisture (SM) and soil respiration (SR), 2015 to 2017, in a Nei Mongol desert steppe

年份 Year	处理 Treatment	土壤温度 ST	土壤含水量 SM	土壤呼吸速率 SR
2015	M	90.56^***	160.57^***	120.88^***
	W	1.40	172.25^***	59.31^***
	M ′ W	0.38	9.10^***	3.27^*
2016	M	37.56^***	377.57^***	939.39^***
	GI	1.65	0.24	7.00^***
	W	0.32	404.03^***	75.63^***
	M ′ W	0.10	4.20^**	4.66^**
2017	M	30.82^***	103.92^***	79.29^***
	GI	1.42	0.49	4.26^**
	W	0.04	159.55^***	250.15^***
	N	0.33	10.92^**	41.55^***
	M ′ W	0.92	4.55^**	16.68^***
	W′ N	0.80	3.05	7.95^**