呼伦贝尔人工栽培草地土壤微生物对无芒雀麦不同播种密度的响应

doi:10.11686/cyxb2017265

草业学报 ›› 2018, Vol. 27 ›› Issue (1): 53-61.DOI: 10.11686/cyxb2017265

呼伦贝尔人工栽培草地土壤微生物对无芒雀麦不同播种密度的响应

李达¹, 王笛¹, 陈金强¹, 辛晓平¹, 徐丽君^{1, *}, 杨桂霞¹, 唐雪娟², 郭明英²

1.中国农业科学院农业资源与农业区划研究所,呼伦贝尔国家野外站,北京100081;
2.呼伦贝尔市草原工作站,内蒙古海拉尔021200

收稿日期:2017-06-05 修回日期:2017-09-11 出版日期:2018-01-20 发布日期:2018-01-20
通讯作者: E-mail:xulijun_nmg@163.com
作者简介:李达(1992-),男,内蒙古牙克石人,硕士。E-mail:547273612@qq.com
基金资助:
“重点研发计划”(2016YFC0500603),“973”人工草地生产力形成机理与调控途径(2015CB150800),现代农业产业技术体系建设专项资金(Cars-35)和中央级公益性科研院所基本科研业务费专项(647-53)资助

Effect of sowing density of Bromus inermis on soil microbial characteristics and enzyme activities

LI Da¹, WANG Di¹, CHEN Jin-qiang¹, XIN Xiao-ping¹, XU Li-jun^{1, *}, YANG Gui-xia¹, TANG Xue-juan², GUO Ming-ying²

1.Institute of Agricultural Resources and Regional Planning of Chinese Academy of Agricultural Sciences, Hulunbuir Grassland Ecosystem Observation and Research Station, Beijing 100081, China;
2.Hulunbuir Grassland Ecosystem Observation and Research Station, Hailar 021200, China

Received:2017-06-05 Revised:2017-09-11 Online:2018-01-20 Published:2018-01-20

摘要/Abstract

摘要： 为明确呼伦贝尔地区人工栽培草地无芒雀麦的适宜播种密度,在呼伦贝尔人工栽培草地播种密度控制平台按照播种密度由低到高设置5个处理组,分别为W₁(7.5 kg·hm^-2)、W₂(15.0 kg·hm^-2)、W₃(22.5 kg·hm^-2)、W₄(30.0 kg·hm^-2)、W₅(37.5 kg·hm^-2),研究土壤微生物对无芒雀麦播种密度的响应特征,并分析了呼吸熵的主要影响因素。结果表明:随着无芒雀麦播种密度的增加,不同时期下无芒雀麦地上生物量呈先升高后降低的趋势,W₄(30.0 kg·hm^-2)达到最大值829.4 kg·hm^-2,W₃(22.5 kg·hm^-2)其次,地下生物量间差异不显著;微生物特性和土壤酶活性中微生物量碳主要呈现先降低后升高的趋势;微生物量氮土壤浅层0~10 cm总体变化平稳,土壤深层10~20 cm呈下降趋势;土壤酶活性的数值显示在第1次刈割期显著高于第2次刈割期,但同时期之间差异不显著;通过探求呼吸熵的主要影响因素结合其影响系数,可得出土壤微生物特性及酶活性对无芒雀麦W₄(30.0 kg·hm^-2)播种密度具有最佳响应。

Abstract: In this study, an experiment with different sowing densities of Bromus inermis: W₁(7.5 kg·ha^-1), W₂(15 kg·ha^-1), W₃(22.5 kg·ha^-1), W₄(30 kg·ha^-1) and W₅(37.5 kg·ha^-1) was conducted to investigate the effect of sowing density on soil microbial characteristics and enzyme (urease, phosphatase and catalase) activities. The aboveground biomass of B.inermis increased with sowing density to W₄(30.0 kg·ha^-1), and then was decreased at W₅ compared to W₄.There was no significant difference between the sowing densities in belowground biomass. For microbial biomass-C, the lowest values occurred at medium sowing densities. Microbial biomass-N in the 0-10 cm soil layer barely changed with sowing density, while in the 10-20 cm soil layer it decreased with increasing sowing density. The soil enzyme activity in the first cutting period was significantly higher than that in the second cutting period, but there was no significant difference among sowing densities within the same regrowth period. Soil microbial characteristics and enzyme activities were optimized at W₄ (30.0 kg·ha^-1).

李达, 王笛, 陈金强, 辛晓平, 徐丽君, 杨桂霞, 唐雪娟, 郭明英. 呼伦贝尔人工栽培草地土壤微生物对无芒雀麦不同播种密度的响应[J]. 草业学报, 2018, 27(1): 53-61.

LI Da, WANG Di, CHEN Jin-qiang, XIN Xiao-ping, XU Li-jun, YANG Gui-xia, TANG Xue-juan, GUO Ming-ying. Effect of sowing density of Bromus inermis on soil microbial characteristics and enzyme activities[J]. Acta Prataculturae Sinica, 2018, 27(1): 53-61.

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呼伦贝尔人工栽培草地土壤微生物对无芒雀麦不同播种密度的响应

Effect of sowing density of Bromus inermis on soil microbial characteristics and enzyme activities

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