短期N、P添加对荒漠草原土壤非保护性有机碳的影响

doi:10.13866/j.azr.2021.01.11

Abstract

Abstract:

To explore the response of the proportion of unprotected organic carbon and the transformation rate of unprotected soil organic carbon into protected soil organic carbon into nutrient addition, the content, proportion, and sensitivity index of particulate organic carbon (POC) and light fraction organic carbon (LFOC) were investigated under nitrogen (N) and phosphorus (P) addition in a desert grassland in arid and semiarid regions. The results showed that soil POC in topsoil (0-10 cm layer) significantly increased by 50%-70% under nutrient addition (N addition, P addition, and combined N and P addition), and the soil LFOC in topsoil significantly increased by 15%-31%. The proportion of unprotected organic carbon significantly increased under nutrient addition (25%-52%), but the conversion rate of unprotected soil organic carbon to protected soil organic carbon decreased (24%-42%). Soil organic carbon is mainly stored as unprotected organic carbon in desert grassland. The labile components of soil organic carbon increased as the proportion of unprotected organic carbon increased under short-term nitrogen and phosphorus addition. Therefore, nutrient addition was detrimental to the stability of soil organic carbon in desert grassland.

Key words: nitrogen addition, phosphorus addition, desert grassland, unprotected soil organic carbon

ZHANG Yarou,AN Hui,WANG Bo,WEN Zhilin,DU Zhongyu,WU Xiuzhi,LI Qiaoling. Effects of short-term nitrogen and phosphorus addition on unprotected soil organic carbon in desert grassland[J].Arid Zone Research, 2021, 38(1): 95-103.

Figures/Tables 8

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处理	土壤颗粒有机碳		土壤轻组有机碳
处理	F	P	F	P
养分添加	1125.9	<0.001	1564.6	<0.001
土层深度	75.9	<0.001	72.4	<0.001
养分添加×土层深度	26.3	<0.001	18.4	<0.001

处理	土层深度/cm	N添加		P添加		N+P添加
处理	土层深度/cm	F	P	F	P	F	P
土壤颗粒有机碳	0~10	173.6	<0.001	189.5	<0.001	23.2	<0.001
	10~20	0.4	0.530	21.2	<0.001	5.8	0.033
	20~30	2.0	0.179	23.0	<0.001	3.1	0.105
土壤轻组有机碳	0~10	38.2	<0.001	0.1	0.785	50.9	<0.001
	10~20	34.0	<0.001	126.6	<0.001	1.1	0.319
	20~30	78.2	<0.001	3.8	0.075	0.6	0.456

处理	土层深度/cm	N添加		P添加		N+P添加
处理	土层深度/cm	F	P	F	P	F	P
颗粒有机碳分配比例	0~10	28.0	<0.001	51.2	<0.001	4.9	0.046
	10~20	0.1	0.808	5.5	0.037	2.4	0.148
	20~30	1.1	0.318	12.1	0.005	1.8	0.209
轻组有机碳分配比例	0~10	1.5	0.250	0.7	0.428	10.9	0.006
	10~20	1.7	0.213	11.8	0.005	7.0	0.021
	20~30	52.8	<0.001	4.7	0.051	15.8	0.002

处理	土层深度/cm	N添加		P添加		N+P添加
处理	土层深度/cm	F	P	F	P	F	P
土壤非保护性有机碳分配比例	0~10	15.5	0.002	18.4	0.001	8.0	0.015
	10~20	0.2	0.673	9.1	0.011	4.7	0.052
	20~30	4.7	0.051	18.4	0.001	9.1	0.011
转化速率常数k	0~10	14.3	0.003	16.5	0.002	9.0	0.011
	10~20	0.7	0.420	9.8	0.009	5.3	0.040
	20~30	7.9	0.016	23.8	<0.001	12.4	0.004

Effects of short-term nitrogen and phosphorus addition on unprotected soil organic carbon in desert grassland

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