干旱区生态环境知识资源中心(Arid): 不同封育年限荒漠草原土壤有机碳矿化对枯落物添加的响应

Arid

	不同封育年限荒漠草原土壤有机碳矿化对枯落物添加的响应
其他题名	Soil organic carbon mineralization response to litter addition in desert steppe grassland sites with differences in number of years grazing exclusion by fencing
	刘金龙 1; 王国会 1; 许冬梅 2; 许爱云 1; 于双 1
来源期刊	草业学报
ISSN	1004-5759
出版年	2019
卷号	28 期号:4 页码:47-57
中文摘要	为探讨不同封育年限荒漠草原土壤有机碳矿化对枯落物添加的响应特征,选取未封育(GG)、封育5年(FG5)、9年(FG9)和12年(FG12)的荒漠草原为研究对象,通过室内培养研究了添加牛枝子枯落物(N+S)、蒙古冰草枯落物(M+S)、短花针茅枯落物(D+S)和混合枯落物(H+S)对不同封育年限荒漠草原土壤有机碳矿化的影响。结果表明,1)枯落物添加显著提高了各封育年限草地土壤有机碳矿化速率和累积矿化量,未封育和封育9年的草地以添加混合枯落物的累积矿化量最高,分别为13.81和15.80 mg·kg~(-1);封育5年和12年的草地则以添加蒙古冰草枯落物的累积矿化量最高,分别达到15.04和13.47 mg·kg~(-1)。添加枯落物后各封育年限草地土壤有机碳的矿化大致可划分为3个阶段:0~6d为迅速释放阶段(活性碳库),7~62d为缓慢释放阶段(慢性碳库),63~76d为稳定释放阶段(惰性碳库)。2)一级动力学方程能够较好地拟合土壤有机碳矿化动态(R~2=0.815~0.932),封育5年的草地土壤矿化潜势最高,为(8.8340.382)mg·kg~(-1)。3)枯落物添加对各封育年限草地土壤有机碳矿化产生了正激发效应,以封育9年草地的激发效应最强。冗余分析(redundancy analysis,RDA)排序结果表明枯落物有机碳和全氮对土壤有机碳矿化有显著影响(F=15.314,P=0.002;F=8.669,P=0.008),累积解释量为70.87%。
英文摘要	This experiment aimed to explore the soil organic carbon mineralization response to litter addition in desert steppe grassland sites with differences in number of years grazing exclusion by fencing.The sites studied were grazed and never fenced(GG),fenced 5 years(FG5),fenced 9 years(FG9)and fenced 12 years(FG12).The effects on soil organic carbon mineralization,of adding litter samples including material from Lespedeza potaninii(N+S),Agropyron mongolicum (M+S),Stipa breviflora (D+S)and mixed plants(H+S)to soil samples from the desert steppe grassland sites with different fencing durations were determined after a laboratory incubation period of 76 days.It was found that:1)Litter addition significantly increased the soil organic carbon mineralization rate and the cumulative mineralization of the soil samples,irrespective of the fencing duration.For the GG and FG9 samples,the cumulative mineralization was highest with H+S litter addition(13.81 and 15.80 mg·kg~(-1),respectively).For the FG5 and FG12 sites,the greatest mineralization occurred with the addition M+S litter(15.04 and 13.47 mg·kg~(-1),respectively).The mineralization process could be roughly divided into three stages:0-6d for rapid release(activate carbon pool),7-62d for slow release(long-term carbon pool)and 63-76d for stable C release(inert carbon pool).2)The first-order kinetic equation was well matched to the mineralization dynamics of soil organic carbon(R~2=0.815-0.932),and the potential mineralization of soil was highest in FG5 grassland(8.8340.382 mg·kg~(-1)).3)Litter addition had a positive priming effect on soil organic carbon mineralization in grasslands of different fencing durations,with the priming effect being strongest in soil from the FG9 site.Representational difference analysis(RDA)sequencing showed that the organic carbon and total nitrogen of litter had significant effects on soil organic carbon mineralization(F= 15.314,P=0.002;F=8.669,P=0.008,respectively,with cumulative R~2 of 70.87%).
中文关键词	荒漠草原 ; 封育 ; 枯落物 ; 有机碳矿化 ; 激发效应
英文关键词	desert steppe fenced litter organic carbon mineralization priming effect
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:6476126
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238976
作者单位	1.宁夏大学农学院, 银川, 宁夏 750021, 中国; 2.宁夏大学农学院;;宁夏大学, ;;西北土地退化与生态恢复国家重点实验室培育基地, 银川;;银川, 宁夏;;宁夏 750021;;750021, 中国
推荐引用方式 GB/T 7714	刘金龙,王国会,许冬梅,等. 不同封育年限荒漠草原土壤有机碳矿化对枯落物添加的响应[J]. 宁夏大学,2019,28(4):47-57.
APA	刘金龙,王国会,许冬梅,许爱云,&于双.(2019).不同封育年限荒漠草原土壤有机碳矿化对枯落物添加的响应.草业学报,28(4),47-57.
MLA	刘金龙,et al."不同封育年限荒漠草原土壤有机碳矿化对枯落物添加的响应".草业学报 28.4(2019):47-57.