氮磷添加下黄土丘陵区退耕草地土壤呼吸速率日变化特征

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Abstract In order to explore the response characteristics of soil respiration (R_s) and its components (heterotrophic respiration, R_h; and autotrophic respiration, R_a) to N and P additions in the grassland and farm withdrawing cultivation, a field split-plot experiment was performed including: [main-plots with 0, 50, and 100kg N/(hm²·a)]; and [subplots: with 0, 40 and 80kg P₂O₅/(hm²·a)]. Such treatments were made every month from May to August in 2019 and for each treatment, these treatments were made: diurnal variations of R_s and R_hand R_a, soil temperature (T_s) and soil water content. Results showed that the diurnal variations of R_s and its two components (i.e. R_h and R_a) showed single-peak curves across all N and P addition treatments, and all reached the maximum values between 12:00~14:00. Compared with no fertilization treatment (CK), R_s, R_h and R_a increased significantly under N addition by 7.31%~13.13%, 1.12%~12.43% and 7.64%~46.26%, respectively, and increased significantly under P addition by 16.84%~18.42%, 11.48%~14.22% and 17.15%~29.59% respectively. N and P combined addition increased R_s, R_h and R_a by 24.17%~27.30%, 21.94%~32.43% and 34.05%~41.26%, respectively. The daytime proportions of whole day carbon emissions from R_s, R_h and R_a under different N and P addition treatments accounted for 52.68%~61.37%, 50.92%~58.70% and 51.39%~76.35%, respectively. The cumulative CO₂emission was the highest at 2012g/m² under a treatment of 50kg N/(hm²·a) combined with 80kg P₂O₅/(hm²·a), and the lowest appeared under no fertilization treatment at 1531g/m². R_s and its two components (R_h and R_a) were significantly positively correlated with the soil temperature (T_s), and their temperature sensitivity (Q₁₀) ranged from 1.19 to 1.86, 1.08 to 1.81, and 1.11 to 3.67, respectively. N and P decreased the Q₁₀ values of R_h, but increased the Q₁₀ values of R_a. In summary, N and P additions increase the rates of R_s and its two components, but decreased the temperature sensitivity of R_h, and the effect of N and P addition on soil respiration rate were related to N and P addition amounts and their ratios.

Key words： soil respiration autotrophic respiration heterotrophic respiration nitrogen and phosphorus addition temperature sensitivity

Received: 10 May 2021

PACS:	X144
	S812.2

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	Articles by authors
	CHEN Yang
	ZHOU Jun-jie
	CHEN Zhi-fei
	JIAN Chun-xia
	LAI Shuai-bin
	XU Bing-cheng

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CHEN Yang,ZHOU Jun-jie,CHEN Zhi-fei等. Effects of nitrogen and phosphorus addition on diurnal variations of soil respiration rate in the grassland and farm withdrawing cultivation on Loess Hilly-gully Region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5779-5792.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I12/5779

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