Many studies has been taken on calculating the vegetation ecological water requirement using plant coefficient(Kp)and potential evapotranspiration(PET),while attention is rarely paid to restriction of soil water deficit and very little information is available on Kp of different communities especially on the Loess Plateau. According to the succession sequence of vegetation in Ziwuling forest region of the Loess Plateau, herbaceous community, shrub community, early forest community and climax forest community were selected to investigate the water consumption and ecological adaptability of different succession stage, considering the soil water stress simultaneously. Using the data getting from long-term experiments in situ, plant coefficients of different communities were calculated in this study, the actual evapotranspiration(ETa)and mean soil water contents during the growing stage for five representative communities were compared, and the impacts of soil water change on water absorption of plant roots and soil water availability were analyzed.The results showed that,in different succession stages of vegetation,ETa of communities was mainly influenced by precipitation, with no notable distinction among different communities(P>0.05); soil water content of the early stage of forest community was significantly higher than other communities, and that of the herbaceous community was clearly higher than the two shrub communities(P<0.05); the plant coefficients of the shrub communities were the highest, that of herbaceous community was the second and that of climax community was higher than early stage of forest community; the two forest communities had significantly higher soil water availability than the herbaceous and shrub communities (P<0.05),which might consume more soil water and aggravate the drought of soil.Therefore, not only the plant coefficients but also the soil water availability should be considered in vegetation construction. And the soil water restriction factor should not be ignored in the calculation of vegetation ecological water requirement and the adaptability evaluation.
WU Yuan-zhi, HUANG Ming-bin, ZHAO Shi-wei
. Plant Coefficient Variation and Adaptability Evaluation of Different Succession Communities on the Loess Plateau[J]. JOURNAL OF NATURAL RESOURCES, 2008
, 23(5)
: 849
-857
.
DOI: 10.11849/zrzyxb.2008.05.012
[1] 杨文治,田均良.黄土高原土壤干燥化问题探源[J].土壤学报,2004,41(1):1~6.
[2] 李裕元,邵明安.黄土高原子午岭森林群落演替与结构特征演化[J].西北植物学报,2003,23(5):693~699.
[3] 周印东,吴金水,赵世伟,等.子午岭植被演替过程中土壤剖面有机质与持水性能变化[J].西北植物学报,2003,23(6):895~900.
[4] 安慧,上官周平.黄土高原植被不同演替阶段优势种的光合生理特性[J].应用生态学报,2007,18(6):1175~1180.
[5] Doorenbos J, Pruitt W O. Guidelines for Predicting Crop Water Requirements[M].Irrigation and Drainage Paper No.24 (2nd edition), FAO, Rome,1977.
[6] 中国主要农作物需水量等值线图协作组.中国主要农作物需水量等值线图研究[M].北京:中国农业科技出版社,1993.
[7] 陈丽华,王礼先.北京市生态用水分类及森林植被生态用水定额的确定[J].水土保持研究,2001,8(4):161~164.
[8] 何永涛,李文华,李贵才,等.黄土高原地区森林植被生态需水研究[J].环境科学,2004,25(3):35~39.
[9] 何永涛,闵庆文,李文华,等.森林植被生态需水量的确定和计算——以泾河流域为例[J].水土保持学报,2004,18(6):152~155.
[10] 马义虎,陈丽华,余新晓.晋南人工刺槐林需水量计算及分析[J].水土保持研究,2005,12(6):89~91.
[11] 陈昌笃.陕甘边境子午岭梢林区的植被及其在水土保持上的作用[J].植物生态学与地植物学资料丛刊,1958,2:152~223.
[12] 张平仓,郑粉莉.子午岭地区自然区域特征及其与土壤侵蚀的关系[J].中国科学院水利部水土保持研究所集刊,1993,17:11~16.
[13] 邹厚远,刘国彬,王晗生.子午岭北部近50年植被的变化发展[J].西北植物学报,2002,22(1):1~8.
[14] 刘东生.黄河中游黄土[M].北京:科学出版社,1964.128,146~149.
[15] Mingbin Huang, Jacques Gallichand, Cuiyun Dong, et al. Use of soil moisture data and curve number method for estimating runoff in the Loess Plateau of China [J].Hydrological Processes,2007,21:1471-1481.
[16] 赵世伟,周印东,吴金水.子午岭次生植被下土壤蓄水性能及有效性研究[J].西北植物学报,2003,23(8):1389~1392.
[17] 雷志栋,杨诗秀,谢森传.土壤水动力学[M].北京:清华大学出版社,1998.185~214.
[18] 钱允褀.农业气象学[M].西安:兴界图书出版公司,1997.55.
[19] 赵勇,王玉坤,多岩松.作物腾发量计算中的一些问题的探讨[J].南水北调与水利科技,2005,3(1):57~59.
[20] 康绍忠,邵明安.作物蒸发蒸腾量的计算方法研究[J].水土保持研究,1991,13:66~74.
[21] 欧阳竹,罗毅,盖广明,等.一个预测冬小麦根系层储水量的概念性模型[J].地理科学进展,2002,21(6): 593~599.
[22] 罗毅,雷志栋,杨诗秀.根系层储水量对随机腾发响应特性的初步分析[J].水利学报,1998,(5):44~48.
[23] 刘勇,上官周平.子午岭森林群落土壤水分与生物量关系研究[J].西北农业学报,2007,16(5):150~154.
[24] 雷志栋,罗毅,杨诗秀,等.利用常规气象资料模拟计算作物系数的探讨[J].农业工程学报,1999,15(3): 119~122.