干旱区生态环境知识资源中心(Arid): 喀斯特石冠腐殖土及其对NH

Arid

	喀斯特石冠腐殖土及其对NH_4~+-N的吸附性能以云南石林为例
其他题名	Humus on karst rock outcrops and their adsorption of ammonia nitrogen :A case from three ecosystems of Shilin, Yunnan
	朱习爱 1; 沈有信 1; 何贝贝 1; 黄金 2
来源期刊	中国岩溶
ISSN	1001-4810
出版年	2015
卷号	34 期号:6 页码:616-623
中文摘要	石冠腐殖土在喀斯特地区广泛分布,具有维系喀斯特生态系统植物多样性、截留沉降养分和水分等重要的生态功能。本文以云南石林为例,选择典型石漠化生态系统、人工林生态系统和次生林生态系统,实地取集各类小生境的石冠腐殖土样,并进行NH_4~+-N吸附实验,探究石冠腐殖土对NH_4~+-N的吸附动力学和等温吸附特征。结果表明:石漠化生态系统、人工林生态系统和次生林生态系统每平方米岩石投影面积的石冠腐殖土分别为40.45士25.38 g、38.899.92 g和397.66142.71 g;石冠腐殖土对NH_4~+-N的吸附动力学遵循准二级反应动力学方程,2 min内能完成吸附量的65%?75%,吸附平衡时间约为20 min;腐殖土对氨氮的吸附量随加入NH_4~+-N浓度的升高而增加,吸附等温线符合Boxlucasl模型,依据此模型计算出的石漠化生态系统石冠腐殖土的吸附性能最大,最大吸附量约7.79 g/kg,人工林次之,为5.29 g/kg,次生林的吸附性能最小,吸附量仅为4.73 g/kg,腐殖土对氨氮的截留率为20%?50%。
英文摘要	A lot of researches had paid attention on canopy humus. Nevertheless, little information is available about the rock outcrop canopy humus in karst ecosystem. Humus offers the growth matrix and nutrients for lithobiontic communities. Humus were collected on the carbonate rocks located in three karst ecosystems with different degree of rocky desertification and quantified; and their adsorption capability on ammonia were investigated in this study by means of simulation experiments. The results showed that the humic substanceson per square meter are 40.45 25.38 g,38.89 9.92 g and 397.66 142.71 g in stony desertification, manmade forest and secondary forest ecosystems,respectively. They were significantly different in three ecosystems. When different ammonia solutions were added,humus would absorb 65% ?75% within 2 min and adsorption equilibrium time was approximately 20 min. The dynamic adsorption data of NH_4~+-N were well described by pseudo second order reaction rate model. Adsorption isotherm of NH_4~+-N on three kinds of humus could be well fitted by Boxlucas 1. Thee quilibrium adsorption capacity of humus followed an increasing order from secondary forest ecosystems (4.73 g/kg),to manmade forest ecosystems (5.29 g/kg), and then stony desertification ecosystems (7.79 g/kg). The retention rates of humus for added NH_4~+-N was 20% ?50%. It revealed that carbonate rock in southern China function as a nutrient pool,even in oligotrophic stony desertification ecosystem.
中文关键词	喀斯特 ; 石冠腐殖土 ; 吸附 ; 云南石林
英文关键词	NH_4~+-N karst rock outcrop canopy humus adsorption NH_4~+-N,Shilin
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:5639527
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233832
作者单位	1.中国科学院西双版纳热带植物园, 昆明, 云南 650000, 中国; 2.石林风景名胜区管理局, 石林, 云南 652211, 中国
推荐引用方式 GB/T 7714	朱习爱,沈有信,何贝贝,等. 喀斯特石冠腐殖土及其对NH_4~+-N的吸附性能以云南石林为例[J],2015,34(6):616-623.
APA	朱习爱,沈有信,何贝贝,&黄金.(2015).喀斯特石冠腐殖土及其对NH_4~+-N的吸附性能以云南石林为例.中国岩溶,34(6),616-623.
MLA	朱习爱,et al."喀斯特石冠腐殖土及其对NH_4~+-N的吸附性能以云南石林为例".中国岩溶 34.6(2015):616-623.