干旱区生态环境知识资源中心(Arid): Soil moisture controls the spatio-temporal pattern of soil respiration under different land use systems in a semi-arid ecosystem of Delhi, India

Arid

DOI	10.1186/s13717-020-0218-0
	Soil moisture controls the spatio-temporal pattern of soil respiration under different land use systems in a semi-arid ecosystem of Delhi, India
	Meena, Archana 1; Hanief, M.2; Dinakaran, J.3; Rao, K. S.4
通讯作者	Meena, Archana
来源期刊	ECOLOGICAL PROCESSES
EISSN	2192-1709
出版年	2020
卷号	9 期号:1
英文摘要	Background Soil respiration (S-R) is a critical process for understanding the impact of climatic conditions and land degradation on the carbon cycle in terrestrial ecosystems. We measured the S-R and soil environmental factors over 1 year in four land uses with varying levels of disturbance and different vegetation types viz., mixed forest cover (MFC), Prosopis juliflora (Sw.) forest cover (PFC), agricultural field (AF), and vegetable field (VF), in a semi-arid area of Delhi, India. Our primary aim was to assess the effects of soil moisture (S-M), soil temperature (S-T), and soil microbial activity (S-MA) on the S-R. Methods The S-R was measured monthly using an LI-6400 with an infrared gas analyser and a soil chamber. The S-M was measured using the gravimetric method. The S-T (10 cm) was measured with a probe attached to the LI-6400. The S-MA was determined by fluorescein diacetate hydrolysis. Results The S-R showed seasonal variations, with the mean annual S-R ranging from 3.22 to 5.78 mu mol m(-2) s(-1) and higher S-R rates of similar to 15-55% in the cultivated fields (AF, VF) than in the forest sites (MFC, PFC). The VF had significantly higher S-R (P < 0.05) than the other land uses (AF, PFC, MFC), which did not vary significantly from one another in S-R (P < 0.05). The repeated measures ANOVA evaluated the significant differences (P < 0.05) in the S-R for high precipitation months (July, August, September, February). The S-M as a single factor showed a strong significant relationship in all the land uses (R-2 = 0.67-0.91, P < 0.001). The effect of the S-T on the S-R was found to be weak and non-significant in the PFC, MFC, and AF (R-2 = 0.14-0.31; P > 0.05). Contrasting results were observed in the VF, which showed high S-R during summer (May; 11.21 mu mol m(-2) s(-1)) and a significant exponential relationship with the S-T (R-2 = 0.52; P < 0.05). The S-R was positively related to the S-MA (R-2 = 0.44-0.5; P < 0.001). The interactive equations based on the independent variables S-M, S-T, and S-MA explained 91-95% of the seasonal variation in S-R with better model performance in the cultivated land use sites (AF, VF). Conclusion S-M was the key determining factor of the S-R in semi-arid ecosystems and explained similar to 90% of the variation. Precipitation increased S-R by optimizing the S-M and microbial activity. The S-MA, along with the other soil factors S-M and S-T, improved the correlation with S-R. Furthermore, the degraded land uses will be more susceptible to temporal variations in S-R under changing climatic scenarios, which may influence the carbon balance of these ecosystems.
英文关键词	Soil respiration Soil moisture Soil microbes Soil temperature Precipitation Land use change Semi-arid ecosystems
类型	Article
语种	英语
国家	India
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000522074200001
WOS关键词	CO2 EFFLUX ; TEMPERATURE-DEPENDENCE ; CARBON MINERALIZATION ; MICROBIAL COMMUNITY ; DRYLAND ECOSYSTEM ; INNER-MONGOLIA ; ALPINE MEADOW ; WATER-CONTENT ; FOREST SOIL ; OAK FOREST
WOS类目	Ecology ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314367
作者单位	1.Univ Rajasthan, Dept Bot, Jaipur 302004, Rajasthan, India; 2.Baba Ghulam Ghulam Shah Badshah Univ, Dept Bot, Rajouri 185234, Jammu & Kashmir, India; 3.Univ Delhi, Bhaskaracharya Coll Appl Sci, Dept Bot, Delhi 110007, India; 4.Univ Delhi, Dept Bot, Delhi 110007, India
推荐引用方式 GB/T 7714	Meena, Archana,Hanief, M.,Dinakaran, J.,et al. Soil moisture controls the spatio-temporal pattern of soil respiration under different land use systems in a semi-arid ecosystem of Delhi, India[J],2020,9(1).
APA	Meena, Archana,Hanief, M.,Dinakaran, J.,&Rao, K. S..(2020).Soil moisture controls the spatio-temporal pattern of soil respiration under different land use systems in a semi-arid ecosystem of Delhi, India.ECOLOGICAL PROCESSES,9(1).
MLA	Meena, Archana,et al."Soil moisture controls the spatio-temporal pattern of soil respiration under different land use systems in a semi-arid ecosystem of Delhi, India".ECOLOGICAL PROCESSES 9.1(2020).