| 岩溶断陷盆地不同海拔植物水分利用效率分析 |
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| 引用本文： | 梁锦桃,邓艳,李旭尧,徐烨,曹建华.岩溶断陷盆地不同海拔植物水分利用效率分析[J].中国岩溶,2020,39(2):180-188. |
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| 作者姓名： | 梁锦桃 邓艳 李旭尧 徐烨 曹建华 |
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| 作者单位： | 1.桂林理工大学环境科学与工程学院，广西 桂林 541006/中国地质科学院岩溶地质研究所/自然资源部岩溶生态系统与石漠化治理重点实验室/自然资源部、广西岩溶动力学重点实验室，广西 桂林 541004 |
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| 基金项目： | 国家重点研发计划课题（2016YFC0502506）；基本科研业务费专项经费（JYYWF20182003） |
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| 摘 要： | 为探讨不同海拔高度的养分、环境要素与植物水分利用效率变化的关系,以岩溶断陷盆地云南小江流域的乔木、灌木、草本为研究对象,分析水分利用效率和叶片养分浓度随海拔的变化情况。结果表明:(1)研究区内海拔2000 m处的草本植物的叶片δ13C值最高,2200 m处的乔木的叶片δ13C值最低;(2)海拔高度对乔木、灌木的植物水分利用效率影响大于草本植物,草本植物的水分利用效率随海拔高度的变化甚微,两者之间的拟合度较小;高值区出现在海拔为2200 m处的乔木;低值区出现在海拔为2000 m处的草本植物;(3)不同海拔水分利用效率与叶片N、P浓度的相关性较弱(与叶片的N浓度呈弱正相关,与叶片的P浓度呈弱负相关);(4)不同海拔水分利用效率与各气候因子的相关性较弱,与多年平均气温、多年平均降雨量、多年平均日照时数均呈弱正相关。
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| 关 键 词： | 岩溶断陷盆地 云南小江流域 稳定碳同位素 水分利用效率 叶片养分 |
Analysis on water use efficiency of plants at different altitudes in karst graben basin |
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| LIANG Jintao,DENG Yan,LI Xuyao,XU Ye,CAO Jianhua.Analysis on water use efficiency of plants at different altitudes in karst graben basin[J].Carsologica Sinica,2020,39(2):180-188. |
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| Authors: | LIANG Jintao DENG Yan LI Xuyao XU Ye CAO Jianhua |
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| Institution: | 1.College of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China/Institute of Karst Geology, CAGS/Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification /Key Laboratory of Karst Dynamics, MNR&GZAR, Guilin, Guangxi 541004, China2.Institute of Karst Geology, CAGS/Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification /Key Laboratory of Karst Dynamics, MNR&GZAR, Guilin, Guangxi 541004, China |
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| Abstract: | The Xiaojiang river watershed is a typical karst graben basin in the edge of the karst plateau and valley slopes in eastern Yunnan. The basin spreads from northeast to east, with terrain overall high in the north and east and low in the south and west. The geomorphology within the basin is divided into five types，karst platform trough valley in the upstream, karst mid-mountains surrounding the basin,basin-level sedimentary flats, karst peak-cluster depressions around the basin bottom, and Xiaojiang karst valley. The basin is located on a low-dimensional plateau, has a sub-tropical and semi-humid climate,a characteristics of the central Yunnan plateau.It hosts different vegetation types associated with the influences of the topography and geomorphology on the distribution and reconfiguration of water,heat, and soil conditions. This study attempted to explore the relationship between nutrients, environmental factors and plant water use efficiency changes at different altitudes,focusing on the trees, shrubs, and herbs in the basin. The stable isotope 13C was used to calculate water use efficiency.Water Uuse Eefficiency (WUE) and leaf nutrient concentration with the altitude were analyzed.The research shows that, (1) in the study area, the δ13C value of the herbaceous plants at 2,000 m is the highest, and the δ13C value of the tree leaves at 2,200 m is the lowest. (2) The tendency of WUE changes at different altitudes is variable,and the effect of altitude on the water efficiency of trees and shrubs is greater than that of herbaceous plants.The water efficiency of herbaceous plants varies little with altitude, and the fit degree between them is small.The high value area appears in the trees at an elevation of 2,200 m, the low value area appears in the herbs at the elevation of 2,000 m. (3) The correlation between WUE and leaf N and P concentrations is weak at different altitudes.WUE is weakly positively correlated with leaf N concentration, and weakly negatively correlated with leaf P concentration. (4) The correlation between WUE and various climatic factors at different altitudes is weak.The elevation WUE is positively correlated with the average annual temperature, the average annual rainfall,and the average annual sunshine hours.It is noted that the correlation between WUE and other environmental factors is not significant,which is a comprehensive manifestation of the special spatial heterogeneity of the coexistence of "basins and mountains" in the graben area. |
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| Keywords: | karst graben basin Xiaojiang river watershed of Yunnan stable carbon isotope water use efficiency leaf nutrient |
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