The Distribution and Growing Seasonal Dynamics of Soil Nitrogen Fractions on Russian Wildrye Grass Pasture Under Different Grazing Intensities

doi:10.11733/j.issn.1007-0435.1999.04.008

›› 1999, Vol. 7 ›› Issue (4): 308-318.DOI: 10.11733/j.issn.1007-0435.1999.04.008

The Distribution and Growing Seasonal Dynamics of Soil Nitrogen Fractions on Russian Wildrye Grass Pasture Under Different Grazing Intensities

Bai Keyu, Han Jianguo, Wang Pei, Song Jinfeng, Wang Xianguo

Institute of Grassland Science, China Agricultural University, Beijing 10094

Online:1999-11-15 Published:1999-11-15

放牧强度对新麦草土壤氮素分配及其季节动态的影响

白可喻, 韩建国, 王培, 宋锦峰, 王显国

中国农业大学草地研究所, 北京 100094

基金资助:
国家科技攻关专题96-016-01-04

Abstract

Abstract: The distribution and growing seasonal dynamics of soil nitrogen fraction under light grazing (LG 0.134hm²/1amb),medium grazing (MG 0.08hm²/1amb), high grazing(HG 0.067hm²/1amb), and no grazing (ck) was carried out on a russian wildrye grass(Psathyrostachys juncea (Fishch)Nevski) pasture during growing season (from mid -June-mid September)in 1997.The order of soil total N percentage in layer of 0~30cm soilwas CK>HG>LG>MG(P<0.01).There were no significant difference among ammonianitrogen under different grazing intensities (P>0.05).Because of the increasing of grazingintensities the content of nitric nitrogen increased in layer of 0~30cm soil.The net mineralizable N of grazing intensity was higher than that of ungrazed, and the content of netmineralizable N of medium grazing intensity was the highest, but there were no significantdifference among them because of short grazing period(P>0.05), Soil microbial biomass Nin layer of 0,30cm soil was ranked as HG>CK>MG>LG(P<0.05).

Key words: Grazing intensity, Total nitrogen percentage, Exchangeble nitrogen, Net mineralizable N, Russian wildryegrass

摘要： 通过不同放牧处理对新麦草人工草地土壤氮素分配及其在生长期间的动态研究。结果表明,0～30cm土层全氮量月均值的顺序为对照>重牧>轻牧>中牧(P<0.01)。放牧强度对铵态氮量未形成显著影响(P>0.05)。0～30cm土层随着放牧强度的增加,硝态氮量逐渐增加。放牧区净可矿化氮量大于对照区,其中以中度放牧区最高。0～30cm土层土壤微生物生物量氮的顺序为重牧>对照>中牧>轻牧(P<0.05)。

关键词: 放牧强度, 净可矿化氮, 可交换氮, 土壤全氮, 微生物生物量氮, 新麦草人工草地

Bai Keyu, Han Jianguo, Wang Pei, Song Jinfeng, Wang Xianguo. The Distribution and Growing Seasonal Dynamics of Soil Nitrogen Fractions on Russian Wildrye Grass Pasture Under Different Grazing Intensities[J]. , 1999, 7(4): 308-318.

白可喻, 韩建国, 王培, 宋锦峰, 王显国. 放牧强度对新麦草土壤氮素分配及其季节动态的影响[J]. , 1999, 7(4): 308-318.

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The Distribution and Growing Seasonal Dynamics of Soil Nitrogen Fractions on Russian Wildrye Grass Pasture Under Different Grazing Intensities

放牧强度对新麦草土壤氮素分配及其季节动态的影响

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