|
典型岩溶流域不同土地利用类型土壤腐殖酸与钙的关系 |
The relationship between humic acids and calcium fractions in soils under contrasting land-use types in a typical Karst Basin |
投稿时间:2020-04-25 修订日期:2020-06-17 |
DOI: |
中文关键词: 土地利用类型 腐殖酸 钙 岩溶流域 |
英文关键词: Different land use types humic acid calcium Karst basin |
基金项目:国家自然科学基金(31760245和31660139)资助的课题Project supported:The National Natural Science Foundation of China(Grant No. 31760245 and 31660139) ,倪大伟3,王 妍1*,2,刘云根1,2 王艳霞1 |
|
摘要点击次数: 400 |
全文下载次数: 0 |
中文摘要: |
为了阐明岩溶地区不同土地利用类型中土壤腐殖酸的分布特征及其与钙的关系,以滇东南典型岩溶流域普者黑流域为研究对象,分析流域内裸地、林地、旱地、水田和湿地5种土地利用类型中土壤表层(0~10 cm)、亚表层(10~20 cm)的WSOM(水溶性有机质)、HA(胡敏酸)、FA(富里酸)的分布情况,并进一步探究土壤中腐殖酸的结构特征及其含量与钙的关系。结果表明:① 研究区5种土地利用类型土壤中w(WSOM)、w(HA)、w(FA)的空间变幅均较大(P<0.05),且表层>亚表层(P<0.05),w(腐殖酸)〔即w(WSOM)、w(HA)、w(FA)三者之和〕的大小排序为旱地(13289.97 mg/kg)>湿地(10007.02 mg/kg)>林地(9136.76 mg/kg)>水田(8708.724 mg/kg)>裸地(3395.13 mg/kg);②5种土地利用类型土壤PQ值(HA在腐殖酸中的比例)以及HA/FA(可以在一定程度上反映土壤有机质的稳定性)的空间变幅较大且变化规律相似(P<0.05),PQ值大小排序为水田(60.07%)>湿地(58.80%)>林地(46.86%)>旱地(45.20%)>裸地(36.43%),HA/FA大小排序为水田(1.73)>湿地(1.55)>林地(0.93)>旱地(0.88)>裸地(0.69);③红外图谱分析表明5种土地利用类型土壤的腐殖酸具有类似的结构组成和官能团信息,除含有一定量的芳香结构外,还含有大量的羟基、氨基、酚羟基、醇羟基以及脂肪链结构;④冗余分析表明土壤全钙及各形态钙在很大程度上影响着腐殖酸的种类及含量,与w(FA)相比,w(HA)与土壤全钙及各形态钙含量之间的相关性显著较高。研究结果显示,普者黑岩溶流域内5种土地利用类型土壤腐殖酸含量空间变幅较大,结构相似且特征明显,其与土壤钙的关系较为密切,同时普者黑流域内5种土地利用类型土壤的腐殖化程度较高,腐殖酸品质较好。 |
英文摘要: |
In order to clarify the distribution characteristics of soil humic acid in different land use types in karst area and its relationship with calcium, the study object is the Puhuhei basin in typical karst basin of southeast Yunnan, the distribution of soil surface (0~10 cm), sub-surface (10~20 cm), HA( humic acid), and fulvic acid in 5 land use types were analyzed, and further explore the structural characteristics of humic acid in soil and the relationship between its content and calcium. The results show: ①The spatial variation of w(WSOM), w(HA) and w(FA) across the five land-use types were significant (P<0.05), and the corresponding change of topsoil was greater than that of subsoil (P<0.05). The size of humic acid was ranked as dry land (13289.97 mg/kg)>wetland (10007.02 mg/kg)>forest land (9136.76 mg/kg)>paddy field (8708.724 mg/kg)>bare land (3395.13 mg/kg). ②The PQ values and HA/FA ratios in soils showed a significant difference across the examined five land-use types (P<0.05), and the changes followed a similar pattern. The PQ values were ranked as paddy field (60.07%)>wetland (58.80%)>forest land (46.86%)> dry land (45.20%)>bare land (36.43%), and the HA/FA ratio were ranked as paddy field (1.73)>wetland (1.55)>forest land (0.93)>dry land (0.88)>bare land (0.69). ③The infrared spectrum of humic acids under five land-use types showed similar structural composition and functional groups, and they contained a large amount of hydroxyl, amino, phenolic hydroxyl, alcoholic hydroxyl and fatty chain structures besides a certain amount of aromatic structure. ④Redundancy analysis showed that the correlations between calcium humic acids in soils varied greatly with target identity, and generally the correlation between HA and calcium was more strongly than that of FA. The results show that the soil humic acid content of five land-use types in the popular black rock basin has a large spatial variation, similar structure and obvious characteristics, which is closely related to soil calcium, and the humic acid quality of five land-use types in the popular black rock basin is better. |
HTML
View Fulltext
查看/发表评论 下载PDF阅读器 |
关闭 |
|
|
|