干旱区生态环境知识资源中心(Arid): 不同生态治理措施下高寒沙化草地土壤氮素变化特征

Arid

	不同生态治理措施下高寒沙化草地土壤氮素变化特征
其他题名	Soil nitrogen characteristics of grassland on sandy soil undergoing vegetation restoration
	蒲琴 1; 胡玉福 1; 蒋双龙 2; 何剑锋 1; 舒向阳 1; 杨泽鹏 1
来源期刊	草业学报
ISSN	1004-5759
出版年	2016
卷号	25 期号:7 页码:24-33
中文摘要	草地沙化是我国最严重的生态环境问题之一。为研究不同生态治理措施对川西北高寒半湿润地区沙化草地土壤氮素的影响,本研究以围栏禁牧布设沙障燕麦和草种混播(YMCD)、围栏禁牧布设沙障播撒草种(RGCD)和围栏禁牧布设沙障自然恢复(WLCD)3种沙化草地治理措施为对象,以未修复沙化草地(CK)为对照,研究了沙化草地生态修复过程中0~60cm 土层土壤氮素的变化特征。结果表明,生态修复3年后,YMCD、RGCD、WLCD 3种治理措施均显著促进地表植被的恢复、土壤物理性质的改善和氮素的积累。其中,YMCD治理措施效果最为显著,其次是RGCD,WLCD效果相对较小。土壤氮素增加幅度呈现出微生物量氮(MBN)>硝态氮(NO_3~- -N)>铵态氮(NH_4~+ -N)>碱解氮(AN)>全氮(TN)特征。与未修复沙化草地相比,YMCD沙地草地地表植被覆盖度增加至74.1%,土壤容重从1.45g/cm~3下降至1.39g/cm~3,夏季地表午温从41.5℃下降至23.0℃;TN、AN、NH_4~+ -N、 NO_3~- -N和MBN含量分别增加了255.8%,270.2%,299.5%,357.8%和745.9%。相关性分析表明地表植被盖度和土壤容重对沙化土壤氮素含量有显著影响。
英文摘要	Grassland desertification is one of the most serious ecological and environmental problems in our country.To investigate changes in soil nitrogen under different vegetation restoration measures in desertified grasslands,the soil nitrogen content under 4vegetation restoration measures in a semi-humid alpine region in northwest Sichuan were measured to elucidate the characteristics of soil total nitrogen and components in 0-60 cm soil layer during ecological restoration.After three yearsrestoration;fencing with mixed sowing of oat and grasses,fencing with sowing of grasses and natural recovery after fencing,all restoration procedures increased vegetation cover and improved soil physical properties,particularly fencing and sowing oat and grasses. Increasing soil N content appeared as microbial biomass N>NO_3~- -N>NH_4~+ -N>available N>total N.Compared with the severely desertified grassland,vegetation cover after fencing and sowing with oat and grasses in- creased to 74.1%,soil bulk density decreased to 1.39g/cm~3,while surface temperature at noon in summer decreased from 41.5℃to 23.0℃.The total N content,available N,NH_4~+ -N,NO_3~- -N and microbial biomass N in oat quadrats increased by 255.8%,270.3%,299.5%,357.8%and 745.9%respectively.Soil particle composition and bulk density were significantly correlated with soil total nitrogen and N components in desertified grassland.We concluded that sowing oat with grass is an effective strategy for repairing desertified grasslands. Oats play the role of a pioneer species because of its drought resistance,tolerance of low fertility and strong tillering,promoting the growth of grass.
中文关键词	生态治理 ; 植被恢复 ; 川西北 ; 沙化草地 ; 土壤氮素
英文关键词	ecological protection vegetation recovery northwestern Sichuan sandy grassland nitrogen
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5754581
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234014
作者单位	1.四川农业大学资源学院, 成都, 四川 611130, 中国; 2.开江县国土资源局, 达州, 四川 636250, 中国
推荐引用方式 GB/T 7714	蒲琴,胡玉福,蒋双龙,等. 不同生态治理措施下高寒沙化草地土壤氮素变化特征[J],2016,25(7):24-33.
APA	蒲琴,胡玉福,蒋双龙,何剑锋,舒向阳,&杨泽鹏.(2016).不同生态治理措施下高寒沙化草地土壤氮素变化特征.草业学报,25(7),24-33.
MLA	蒲琴,et al."不同生态治理措施下高寒沙化草地土壤氮素变化特征".草业学报 25.7(2016):24-33.