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

干旱区研究 ›› 2021, Vol. 38 ›› Issue (1): 95-103.doi: 10.13866/j.azr.2021.01.11

短期N、P添加对荒漠草原土壤非保护性有机碳的影响

张雅柔¹(),安慧¹(),王波²,文志林²,杜忠毓¹,吴秀芝¹,李巧玲³

1.宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地,西北退化生态系统恢复与重建教育部重点实验室,宁夏银川 750021
2.盐池县草原实验站,宁夏吴忠 751506
3.宁夏大学农学院,宁夏银川 750021

收稿日期:2020-05-12 修回日期:2020-07-23 出版日期:2021-01-15 发布日期:2021-03-05
通讯作者: 安慧
作者简介:张雅柔（1994-）,女,硕士研究生,主要从事植物生态学研究. E-mail: zhangyr007@163.com
基金资助:
国家自然科学基金(31960244);宁夏自然科学基金项目(2020AAC03292);宁夏回族自治区西部一流学科项目(NXYLXK2017B06)

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

ZHANG Yarou¹(),AN Hui¹(),WANG Bo²,WEN Zhilin²,DU Zhongyu¹,WU Xiuzhi¹,LI Qiaoling³

1. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ministry of Education Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China, Ningxia University, Yinchuan 750021, Ningxia, China
2. Grassland Experiment Station of Yanchi, Wuzhong 751506, Ningxia, China
3. School of Agriculture, Ningxia University, Yinchuan 750021, Ningxia, China

Received:2020-05-12 Revised:2020-07-23 Online:2021-01-15 Published:2021-03-05
Contact: Hui AN

摘要/Abstract

摘要：

以干旱、半干旱地区荒漠草原土壤为研究对象,研究N、P养分添加对荒漠草原0~30 cm土层土壤颗粒有机碳和轻组有机碳含量、分配比例、敏感指数的影响,探讨荒漠草原土壤非保护性有机碳分配比例及其向保护性有机碳的转化速率对N、P添加的响应。研究结果表明：短期N、P添加能促进荒漠草原表层土壤（0~10 cm）土壤颗粒有机碳和轻组有机碳的积累,分别使其增加了50%~70%、15%~31%。短期N、P添加显著增加土壤非保护性有机碳分配比例（25%~52%）,而降低了土壤非保护性有机碳向保护性有机碳转化速率常数（24%~42%）。荒漠草原土壤有机碳主要以非保护性有机碳形式储存,短期N、P添加通过影响土壤非保护性有机碳分配比例,使土壤肥力提高,土壤有机碳的活性组分增加,不利于土壤有机碳的稳定。

关键词: N添加, P添加, 荒漠草原, 非保护性有机碳

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

张雅柔,安慧,王波,文志林,杜忠毓,吴秀芝,李巧玲. 短期N、P添加对荒漠草原土壤非保护性有机碳的影响[J]. 干旱区研究, 2021, 38(1): 95-103.

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.

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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

短期N、P添加对荒漠草原土壤非保护性有机碳的影响

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

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