短期氮磷添加对荒漠草原土壤活性有机碳的影响

doi:10.11686/cyxb2019234

草业学报 ›› 2019, Vol. 28 ›› Issue (10): 12-24.DOI: 10.11686/cyxb2019234

短期氮磷添加对荒漠草原土壤活性有机碳的影响

张雅柔¹, 安慧^1,*, 刘秉儒¹, 文志林³, 吴秀芝¹, 李巧玲², 杜忠毓¹

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.宁夏大学农学院,宁夏银川 750021;
3.盐池县草原实验站,宁夏盐池 751506

收稿日期:2019-04-09 修回日期:2019-07-08 出版日期:2019-10-20 发布日期:2019-10-20
通讯作者: E-mail: anhui08@163.com
作者简介:张雅柔(1994-),女,陕西榆林人,在读硕士。E-mail: zhangyr007@163.com
基金资助:
国家自然科学基金(31660168),宁夏自然科学基金(NZ17004),宁夏回族自治区西部一流学科项目(NXYLXK2017B06)和宁夏大学研究生创新项目(GIP2019042)资助

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

ZHANG Ya-rou¹, AN Hui^1,*, LIU Bing-ru¹, WEN Zhi-lin³, WU Xiu-zhi¹, LI Qiao-ling², DU Zhong-yu¹

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, China;
2.School of Agriculture, Ningxia University, Yinchuan 750021, China;
3.Grassland Experiment Station of Yanchi, Yanchi 751506, China

Received:2019-04-09 Revised:2019-07-08 Online:2019-10-20 Published:2019-10-20
Contact: E-mail: anhui08@163.com

摘要/Abstract

摘要： 以干旱、半干旱地区荒漠草原土壤为研究对象,研究氮(N)、磷(P)添加对荒漠草原0~30 cm土层土壤溶解性有机碳、微生物生物量碳和易氧化有机碳含量及有效率、土壤碳库管理指数(CPMI)、敏感指数(SI)的影响,探讨N、P添加后土壤溶解性有机碳、微生物生物量碳和易氧化有机碳对碳库管理指数的表征作用。结果表明,N添加、P添加或NP共同添加对荒漠草原0~20 cm土壤溶解性有机碳的累积有显著促进作用,但对0~20 cm土壤微生物生物量碳无显著影响。NP共同添加显著增加0~10 cm土层土壤易氧化有机碳。0~30 cm土层N、P添加的土壤溶解性有机碳的各项敏感指数均高于易氧化有机碳,说明土壤溶解性有机碳对短期N、P添加反应最敏感,因此可作为荒漠草原短期N、P添加对土壤有机碳变化的指示物。短期N、P添加能提高碳库管理指数,增加土壤有机质含量,促进荒漠草原土壤恢复。

关键词: N添加, P添加, 荒漠草原, 活性有机碳, 碳库管理指数

Abstract: In this study, nitrogen (N) and phosphorus (P) were added to desert grasslands in arid and semiarid regions. We determined the concentration and efficiency of dissolved organic carbon (DOC), microbial biomass carbon (MBC), and easily oxidized organic carbon (EOC), and we calculated carbon management indicator (CMI) and sensitivity index (SI) values. The results showed that nutrient addition (N, P, and N+P) significantly increased the soil DOC concentration in the 0-20 cm layer, but did not affect the soil MBC concentration in the 0-20 cm layer. The soil EOC concentration in the 0-10 cm layer was significantly increased by the addition of N+P. In the 0-30 cm layer, all sensitivity indexes of soil DOC were higher than those of soil EOC, indicating that soil DOC was more sensitive than soil EOC to short-term N and P addition. Therefore, soil DOC could be used as an indicator of the changes in SOC after short-term N and P additions to desert grassland. The CMI and soil organic matter content were increased by short-term N and P addition. These results indicate that short-term N and P addition can promote the restoration of soils in desert grassland.

Key words: nitrogen addition, phosphorus addition, desert grassland, labile organic carbon, carbon pool management index

张雅柔, 安慧, 刘秉儒, 文志林, 吴秀芝, 李巧玲, 杜忠毓. 短期氮磷添加对荒漠草原土壤活性有机碳的影响[J]. 草业学报, 2019, 28(10): 12-24.

ZHANG Ya-rou, AN Hui, LIU Bing-ru, WEN Zhi-lin, WU Xiu-zhi, LI Qiao-ling, DU Zhong-yu. Effects of short-term nitrogen and phosphorus addition on soil labile organic carbon in desert grassland[J]. Acta Prataculturae Sinica, 2019, 28(10): 12-24.

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短期氮磷添加对荒漠草原土壤活性有机碳的影响

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

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