采用极点排序法对贵州普定县喀斯特地区的草本群落进行了研究，分析了草本植物盖度和土壤养分的相关性。结果表明：该地区土壤速效钾含量是限制草本群落分布的主要因素；盖度与土壤的全钾含量、水解氮含量、有效磷含量呈显著正相关，与土壤速效钾含量呈极显著正相关，相关性系数达0.96。盖度随速效钾含量的增加先迅速增加，当土壤速效钾含量达148.34 mg/kg时，增速急剧降低，最后渐近平缓。因此，在喀斯特地区对草本群落的分布和恢复起到最主要作用的因子是土壤速效钾含量。
Abstract
By using the method of Polar Ordination, herb community in the Karst area was ordered. The correlation between the coverage of herb vegetation and soil nutrient index was analyzed. The results indicated that the available potassium in the soil was the main factor that limited the distribution of herb community in this area. The coverage was direct correlated to the total potassium, hydrolysable nitrogen and available phosphonium in the soil, also significantly direct correlated to the available potassium in the soil with the coefficient of correlation 0.96. The coverage increased rapidly with the increasing of the available potassium, however, when the amount of available potassium in the soil reached 14834 mg/kg, the growth rate decreased sharply and finally asymptotically flatted.
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1]张金屯.数量生态学[M].北京:科学出版社,2004.
[2]陈仲新,张新时.毛乌素沙化草地景观生态分类与排序的研究[J].植物生态学报,1996,20(5):423-437.
[3]焦健,孙学刚,田波生.甘肃文县珙桐群落的二维极点排序[J].甘肃农业大学学报,1998,33(4):393-397.
[4]徐广平,张德罡,蒲小鹏,等.东祁连山高寒草地植物群落二维极点排序[J].草原与草坪,2005(3):42-45.
[5]卢晓强,杨德超,张显松.贵州喀斯特地区侧柏人工林天然更新效果的因子分析法研究[J].西部林业科学, 2006, 35(2): 78-81.
[6]章文波,刘宝元,吴敬东.小区植被覆盖度动态快速测量方法研究[J].水土保持通报,2001,21(6):60-63.
[7]宋永昌.植被生态学[M].上海:华东师范大学出版社,2001.
[8]中国科学院南京土壤研究所.土壤理化分析[M].上海:上海科技出版社, 1978.
[9]Goff F G,Cottam G.Gradient analysis:the use of species and synthetic indices[J].Ecology,1967(48):793- 806.
[10]Lumbanraja J, Evangelou V P. Binary and ternary exchange be haviour of potassium and ammonium on Kentucky subsoils[J]. Soil Sci Soc Am J, 1990(54):698-705.
[11]Chen J S, Mackenzie A F.Fixed ammonium and potassium as affected by added nitrogen and potassium in three quebec soils[J]. Communications in Soil Science and Plant Analysis,1992,23(11/12):1145-1159.
[12]王志强,刘宝元,海春兴.土壤厚度对天然草地植被盖度和生物量的影响[J].水土保持学报,2007,21(4):164-167.
[13]李英年,张法伟,刘安花,等.矮蒿草草甸土壤温湿度对植被盖度变化的响应[J].中国农业气象,2006,27(4):265-268.
[14]刘秉儒.红砂植被盖度对土壤不同形态碳、氮及细菌多样性的影响[J].干旱地区农业研究,2009,27(4):156-161.
[15]杨振明,阎飞，韩丽梅.土壤钾素研究的新进展[J].吉林农业大学学报，1998,20(3):99-106.
[16]彭 浩,张兴昌,邵明安.雨强对黄土区土壤钾素径流流失的影响[J].生态环境,2004,13(3):369-372.
[17]陈正刚,李剑,朱青,等.贵州山区坡耕地钾素输入与输出研究[J].水土保持学报,2009,23(4):20-23.
[18]陈旭晖,陈湘燕.贵州土壤钾素状况与钾肥施用问题[J].西南农业大学学报,2003,25(2):157-163.
[19]司 彬,姚小华,任华东,等.黔中喀斯特植被恢复演替过程中土壤理化性质研究[J].江西农业大学学报,2008,30(6):1122-1125.
基金
收稿日期：2010-12-13修回日期：2011-05-09基金项目：“十一五”国家科技支撑计划(2006BAD03A0303)第一作者：高晟, 硕士生。*通信作者:薛建辉, 教授。Email: jhxue@njfu.edu.cn
PDF(1429788 KB)
