Soil respiration characteristics and its influencing factors in cotton fields under mulched drip irrigation
LIU Fangting1,2, FAN Wenbo1,2*, ZHANG Jinxi1,2, JIANG Yu1,2, YANG Haimei1,2, DONG Qianqian1,2, LI Changxiao1,2
1.College of Water & Architecture Engineering, Shihezi University, Shihezi, Xinjiang 832003, China; 2.Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production & Construction Group, Shihezi University, Shihezi, Xinjiang 832003, China
Abstract：To study the dynamic changes of soil respiration and its impact factors of cotton fields under mulched drip irrigation, during growth periods of cotton, adopting Li-8100A automatic determination of soil carbon flux, soil respiration rate and environment factors on the ridge were continuously observed, in the ridge and bare land. The results show that the daily variation of soil respiration rate of the three samples expresse a single peak curve, and the peak appeares at 14:30. The soil respiration rate of the three samples increases first and then decreases with the seasonal change, and the soil respiration rate reaches the highest level in the middle and late July. The soil respiration rate and soil organic carbon quality ratio of the three sample plots are significantly different, the sequence of which from high to low is on the ridge, in the ridge and bare land, and the total amount of soil respiration on the ridge is the largest, which is 1.5 times and 2.8 times that in the ridge and bare land, while the sequence of soil temperature difference from high to low is bare land, on the ridge, in the ridge. According to the research by the method of correlation analysis, the correlation between soil respiration rate and soil moisture content is weak, but it is positively correlated with soil organic carbon quality ratio. Soil temperature can explain the variability of soil respiration rate from 75.1% to 84.4% and show a higher exponential positive correlation. The sensitivity of soil respiration to temperature is significantly different in three types of soil, the sequence of which from high to low is on the ridge(2.208), in the ridge(2.160)and bare land(1.675).
[1]QIN Y, YI S H, LI N J, et al. Advance in studies of carbon cycling on alpine grasslands of the Qinghai-Tibetan Plateau[J]. Acta prataculturae sinica, 2012, 21(6): 275-285.[2]AKBOLAT D, COSKAN A. Quantifying soil respiration in response to short-term tillage practices: a case study in southern Turkey[J]. Acta agriculturae scandinavica, 2009, 59(1): 50-56.[3]严俊霞,秦作栋,张义辉,等. 土壤温度和水分对油松林土壤呼吸的影响[J]. 生态学报,2009,29(12):6366-6376. YAN Junxia, QIN Zuodong, ZHANG Yihui, et al. Effect of soil temperature and moisture on soil CO2 efflux in a Pinus tabulaeform is forest[J]. Acta ecologica sinica, 2009, 29(12): 6366-6376.(in Chinese)[4]贺美,王立刚,王迎春,等. 长期定位施肥下黑土呼吸的变化特征及其影响因素[J]. 农业工程学报,2018,34(4):151-161. HE Mei, WANG Ligang, WANG Yingchun, et al. Characteristic of black soil respiration and its influencing factors under long-term fertilization regimes[J]. Transa-ctions of the CSAE, 2018, 34(4): 151-161.(in Chinese)[5]崔海,张亚红. 干旱区荒漠草原土壤呼吸速率日动态特征及影响因子[J]. 核农学报,2016,30(8):1614-1624. CUI Hai, ZHANG Yahong. Diurnal variation of soil respiration rate and its influence factors in different weather conditions in desert steppe of arid region[J]. Journal of nuclear agricultural sciences, 2016, 30(8): 1614-1624.(in Chinese)[6]CHEN Z, XU Y, ZHOU X, et al. Extreme rainfall and snowfall alter responses of soil respiration to nitrogen fertilization: a 3-year field experiment[J]. Global change biology, 2017, 23(8): 3403-3417.[7]张前兵,杨玲,孙兵,等. 干旱区灌溉及施肥措施下棉田土壤的呼吸特征[J]. 农业工程学报,2012,28(14):77-84. ZHANG Qianbing, YANG Ling, SUN Bing, et al. Respiration characteristics of cotton soil under irrigation and fertilization measures in arid region[J]. Transactions of the CSAE, 2012, 28(14): 77-84.(in Chinese)[8]张晓龙,沈冰,权全,等. 渭河平原农田冬小麦土壤呼吸及其影响因素[J]. 应用生态学报,2016,27(8):2551-2560. ZHANG Xiaolong, SHEN Bing, QUAN Quan, et al. Soil respiration rates and its affecting factors in winter wheat land in the Weihe Plain, Northwest China[J]. Chinese journal of applied ecology, 2016, 27(8): 2551-2560.(in Chinese)[9]LI Zhiguo, ZHANG Runhua, WANG Xiujun, et al. Carbon dioxide fluxes and concentrations in a cotton field in Northwestern China: effects of plastic mulching and drip irrigation[J]. Pedosphere, 2011, 21(2):178-185.
