东祁连山高寒灌丛草地土壤微生物量及土壤酶季节性动态特征

草业学报 ›› 2011, Vol. 20 ›› Issue (6): 135-142.

东祁连山高寒灌丛草地土壤微生物量及土壤酶季节性动态特征

杨成德¹,龙瑞军²,陈秀蓉¹,徐长林¹,薛莉¹

1.甘肃农业大学草业学院草业生态系统教育部重点实验室甘肃省草业工程实验室中-美草地畜牧业可持续发展研究中心,甘肃兰州730070;
2.兰州大学草地农业科技学院,甘肃兰州730020

收稿日期:2010-09-08 出版日期:2011-06-25 发布日期:2011-12-20
作者简介:杨成德(1975-),男,甘肃武都人,副教授,博士。E-mail:yangcd@gsau.edu.cn,ycd3003@163.com
基金资助:
甘肃省自然科学基金(096RJZA003)和退化草原植被恢复与碳固定之间的研究(052456CHA-GS-Y-4)资助。

Seasonal dynamics in soil microbial biomass and enzymatic activities under different alpine brushlands of the Eastern Qilian Mountains

YANG Cheng-de¹, LONG Rui-jun², CHEN Xiu-rong¹, XU Chang-lin¹, XUE Li¹

1.College of Pratacultural Science, Gansu Agricultural University; Key Laboratory of Grassland Ecosystem (Gansu Agricultural University), Ministry of Education; Sino-U.S. Center for Grazingland Ecosystem Sustainability, Lanzhou 730070, China;
2.College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China

Received:2010-09-08 Online:2011-06-25 Published:2011-12-20

摘要/Abstract

摘要： 本试验以东祁连山杜鹃灌丛草地、高山柳灌丛草地和金露梅灌丛草地为研究对象,对土壤微生物量和土壤酶的季节性动态等进行了研究。结果表明,土壤微生物量碳的季节动态表现为从5月到7月显著上升(P<0.05),之后到9月显著下降(P<0.05),9月到11月又略有上升,最大值和最小值分别出现在7月和9月;除高山柳灌丛草地土壤微生物量氮外,土壤微生物量氮和磷季节动态为从5月到9月显著下降(P<0.05),9月后又略有上升,但差异不显著,最大值在5月;土壤微生物量碳、氮和磷分别对土壤有机质、全氮和全磷的贡献率季节动态与微生物量碳、氮和磷季节动态基本一致;土壤微生物量碳氮比介于5.79~10.31,最大值出现在7月,最小值出现在9月,下层高于上层。在3个灌丛草地,脲酶季节动态表现为从5月到7月上升,7月之后下降,最大值出现在7月,最小值出现在11月;杜鹃灌丛草地和高山柳灌丛草地中性磷酸酶最大值在11月,但金露梅灌丛草地最大值在9月,该酶在3个灌丛草地季节动态差异明显,在杜鹃灌丛草地从5月到7月略上升,7月到9月显著下降(P<0.05),9月后显著上升(P<0.05),在金露梅灌丛则为从5月到9月上升,后下降,而在高山柳灌丛则为从5月到11月逐渐上升。

Abstract: The soil microbial biomass and enzymatic activities were studied under Rhododendrons alpine brush lands (RB), Salix cupularis alpine brush lands (SB) and Dasiphoru fruticosa alpine brush lands (DB) of the Eastern Qilian Mountains in the Qinghai-Tibetan Plateau, China. The seasonal trend of soil microbial biomass carbon (SMBC) increased significantly from May to July (P<0.05), and then fell significantly from July to September (P<0.05), before increasing again until November across all three sites. However, the soil microbial biomass nitrogen (SMBN) and the soil microbial biomass phosphorus (SMBP) significantly decreased from May to September then increased again after September except that the SMBN under SB decreased from May to November. The seasonal dynamics of SMBC/soil organic matter (SOM), SMBN/soil total nitrogen (STN) and SMBP/soil total phosphorus (STP) showed similar trends to the SMBC, SMBN and SMBP, respectively. The annual mean ratio of SMBC/SMBN was 5.79-10.31: this was higher in the lower than in the upper layer. The maximum was in July and the minimum in September. Urease activities gradually increased from May to July, and then decreased after July across all three sites. The seasonal dynamics of neutral phosphatase activities (NPA) increased from May to July, but significantly (P<0.05) decreased from July to September, and then gradually increased after September at RB. At SB, the NPA gradually increased from May to November while at DB, it increased from May to September, and then decreased after September.

中图分类号:

S812.2

杨成德,龙瑞军,陈秀蓉,徐长林,薛莉. 东祁连山高寒灌丛草地土壤微生物量及土壤酶季节性动态特征[J]. 草业学报, 2011, 20(6): 135-142.

YANG Cheng-de, LONG Rui-jun, CHEN Xiu-rong, XU Chang-lin, XUE Li. Seasonal dynamics in soil microbial biomass and enzymatic activities under different alpine brushlands of the Eastern Qilian Mountains[J]. Acta Prataculturae Sinica, 2011, 20(6): 135-142.

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