特大暴雨下油松林根系对土壤元素迁移的影响
Effectiveness of pine roots on elements transport of loess soil during the heavy rainstorm on the Chinese Loess Plateau
查看参考文献18篇
文摘
|
根际是元素由土壤进入植物体的主要界面,降水对根际土壤元素的迁移有显著影响。本文用原状土柱淋滤实验装置及大型挖掘剖面壁法,定量分析了特大暴雨下不同深度土层油松林根系影响土壤元素的稳定输出通量的剖面特征,旨在探索黄土区林木根系对土壤养分生物有效性的提高途径。研究结果表明,特大降雨条件下,油松林地的元素随土层深度增加呈明显的递减规律,在农地土壤剖面中变异不明显。油松林地元素稳定输出通量的平均值显著大于无根系土壤。油松林0-30cm土壤剖面中的元素输出通量占总剖面元素输出通量的96.32%;油松林根系对常量元素K、Na、Mg、Ca、有益元素Si、微量营养元素Mn有明显稳定强化作用的土层深度范围为0-30cm,对有益元素Al和微量元素Cu、Fe有明显稳定强化作用的土层深度范围为0-45cm。 |
其他语种文摘
|
Plant roots are the main interface for plants to uptake nutrients from soil and may have potential impacts to intensify elements transport in the loess soil, Climate, especially rainfall is the main factor for soil formation and soil environment. To assess the effectiveness of plant roots on elements transport of loess soil during the heavy rainstorm, a field study was carried out on nutrients transport in the forest ( Pinus tabulaeformis ) soil as affected by pine roots and farmland soil with no roots as the control on the hilly and gully areas of the Loess Plateau. With the method of a large-size profile for measuring root density and root weight and an equipment of undisturbed monolith soil for measuring elements transport of loess soil, we investigated transport flux of 9 elements in the loess soil during the rainfall of 200 mm and rain intensity of 2.0 mm/min. The objective was to establish the effective model of plant root for intensifying elements transport flux in the loess soil, in order to provide a scientific foundation for improving the nutrients uptake of plant roots and establishing the fine artificial ecological systems of soil and water conservation. The results indicated that differences among elements transport flux in the loess soil during the heavy rainstorm were not only depended on the amount of elements in soil but mainly on the distribution of plant roots less than 1 mm in diameters. Impacts of plant roots on intensifying elements transport in the different depth of the loess soil decreased as the soil depth increased. As for the pine-land during the heavy rainstorm, elements output flux in the soil layer of 0-60 cm decreased significantly with the increase of the soil depth; as for the farmland, there are no significant differences for the whole soil profile. The impacts on the transport flux of K, Na, Mg, Ca, Si, Mn tended sharply to lighter in the soil layer of 0-30 cm, but its impacts on the transport flux of Al, Cu, Fe approached sharply to smaller in the soil layer of 0-45 cm in the pine-land during the heavy rainstorm as the increase of soil depth. The effective root parameters had significant positive relationship with the impacts of plant roots to intensify elements transport in soil profiles on the Loess Plateau with the R2 between 0.95 and 0.99. |
来源
|
植物营养与肥料学报
,2007,13(1):51-56 【核心库】
|
关键词
|
根系
;
特大暴雨
;
元素迁移通量
;
有效性模式
;
黄土高原
|
地址
|
1.
中国科学院西北高原生物研究所, 西宁, 810008
2.
中国农业科学院农业环境与可持续发展研究所, 北京, 100081
3.
中国科学院地球化学研究所, 贵阳, 550002
|
语种
|
中文 |
文献类型
|
研究性论文 |
ISSN
|
1008-505X |
学科
|
农业基础科学 |
基金
|
国家自然科学基金项目
|
文献收藏号
|
CSCD:2820254
|
参考文献 共
18
共1页
|
1.
Pierret A. Observing plant roots in their environment:Current imaging options and specific contribution of two-dimensional approaches.
Agronomie,2003,23:471-479
|
被引
2
次
|
|
|
|
2.
Azaizeh H. Effects of NaCl and CaCl2 on water transport across root cells of maize(Zea mays L.)seedlings.
Plant Physiol,1992,99:886-894
|
被引
18
次
|
|
|
|
3.
刘东生.
黄土与环境,1985:358-366
|
被引
6
次
|
|
|
|
4.
朱显谟. 黄土高原的形成与开发整治对策.
水土保持通报,1991,11(1):1-8
|
被引
35
次
|
|
|
|
5.
李勇. 黄土高原植物根系提高土壤抗冲性的有效性.
科学通报,1991,36:935-938
|
被引
67
次
|
|
|
|
6.
Canadell J. Maximum rooting depth of vegetation types at global scale.
Oecologia,1996,108:583-595
|
被引
94
次
|
|
|
|
7.
Jackson R B. A global analysis of root distributions for terrestrial biomes.
Oecologia,1996,108:389-411
|
被引
266
次
|
|
|
|
8.
Hendrick R L. The demography of fine root in a northern hardwood forest.
Ecology,1992,73:1094-1104
|
被引
63
次
|
|
|
|
9.
Liedgens M. Minirhizotron observations of the spatial distribution of the maize root system.
Agron J,2001,93:1097-1104
|
被引
11
次
|
|
|
|
10.
Roy S. Seasonal and spatial dynamics of plant-available N and P pools and N-mineralization in relation to fine roots in a dry tropical forest habitat.
Soil Biol Biochem,1995,27:33-40
|
被引
8
次
|
|
|
|
11.
廖利平. 杉木(Cunninghamia lanceolata)、火力楠(Michelia macclurei)纯林及其混交林细根分布、分解与养分归还.
生态学报,1999,19(3):342-346
|
被引
47
次
|
|
|
|
12.
马北雁. 土壤中离子交换和运移的模拟研究进展.
植物营养与肥料学报,1998,4(1):84-91
|
被引
4
次
|
|
|
|
13.
宋海星. 水、氮供应和土壤空间所引起的根系生理特性变化.
植物营养与肥料学报,2004,10(1):6-11
|
被引
40
次
|
|
|
|
14.
单建平. 长白山阔叶红松林细根周转的研究.
应用生态学报,1993,4(3):241-245
|
被引
83
次
|
|
|
|
15.
翟明普. 杨树刺槐混交林细根养分动态研究.
林业科学,2004,40(4):46-51
|
被引
21
次
|
|
|
|
16.
李勇. 黄土区植物根系对营养元素在土壤剖面中迁移强度的影响.
植物营养与肥料学报,2005,11(4):427-434
|
被引
20
次
|
|
|
|
17.
Bohm W.
Methods of studying root systems,1979
|
被引
26
次
|
|
|
|
18.
万国江.
环境质量的地球化学原理,1998
|
被引
5
次
|
|
|
|
|