摘要
本研究以贵州省六盘水大河煤矿煤矸石山种植年限为8年的香根草(Vetiveria zizanioides)为研究对象,对香根草生育期内(5–10月)根、茎、叶中营养元素(N、P、K)分配的动态变化进行分析,并对香根草不同器官之间养分元素进行Pearson相关性分析和异速关系分析。结果表明:从年均值来看,香根草各器官中N、P含量大小表现为叶>茎>根,K含量大小表现为茎>叶>根;根、茎中N和K含量随生育期的延长呈现先升高后降低的趋势,叶中N、P、K含量基本表现出逐渐降低的变化趋势,根中P含量表现出逐渐升高的变化趋势;Pearson相关分析表明,根中N和K、茎中P和K及N和K均表现出显著正相关关系(P<0.05),其相关系数分别为0.585、0.590和0.692,叶中N、P、K间存在极显著的正相关关系(P<0.01),其相关系数分别为0.712、0.899和0.849;不同器官营养元素的异速关系分析表明,根中N、P、K含量均不存在显著的异速生长关系,而茎、叶中N、P、K含量均具有显著或极显著的异速生长关系。本研究从营养分配角度探讨香根草不同器官中N、P、K含量的动态变化,有助于了解不同生长阶段香根草在煤矸石基质中生存的养分利用规律及养分贫瘠生境中的调控机制,为利用香根草进行煤矸石的植被恢复提供理论依据。
This study focused on 8-year old plantings in the coal gangue at Dahe Coal Mine in Liupanshui,Guizhou Province.We analyzed the dynamic changes in nutrient elements(N,P,and K)in the roots,stems,and leaves of Vetiveria zizanioides(May to October)and the relationship between Pearson’s correlation and allometric growth.Based on the annual mean value,the N and P content in the organs of V.zizanioides was leaf>stem>root,whereas the K content was stem>leaf>root.The N and K content in the roots and stems first increased and then decreased,whereas the N,P,and K content in the leaves decreased and the P content in the roots increased with the growth period.Pearson’s correlation analysis showed a significant positive correlation between N and K in the roots,P and K,and N and K in the stems(P<0.05),and the correlation coefficients were 0.585,0.590,and 0.692,respectively.Significant positive correlations were observed among N,P,and K content in the leaves(P<0.01)and the correlation coefficients were 0.712,0.899,and 0.849,respectively.The allometric relationship of nutrient elements in the different organs showed no significant difference among N,P,and K content in the roots.However,the N,P,and K content in the stems and leaves showed highly significant allometric relationships.This study may have partly revealed the regulation of nutrient use by V.zizanioides in the gangue matrix and the regulatory mechanism in the nutrient-poor habitat at different growth stages by the dynamic changes in N,P,and K in different organs of V.zizanioides.Our results provide a theoretical basis for the utilization of V.zizanioides for vegetation restoration of coal gangue.
作者
盛美群
郝俊
龙水义
许钟丹
毛圆圆
程巍
SHENG Meiqun;HAO Jun;LONG Shuiyi;XU Zhongdan;MAO Yuanyuan;CHENG Wei(College of Animal Science,Guizhou University,Guiyang 550025,Guizhou,China;Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region,Guizhou University,Guiyang 550025,Guizhou,China)
出处
《草业科学》
CAS
CSCD
2019年第8期1999-2007,共9页
Pratacultural Science
基金
国家自然科学基金(31500451)
贵州省科学技术基金(黔科合J字[2014]2055)
贵州省科技合作计划(黔科合LH字[2015]7667)
贵州省教育厅自然科学研究项目(黔教合KY字[2014]303)
关键词
香根草
煤矸石山
营养分配
养分利用
异速关系
Vetiveria zizanioides
coal spoil-heaps
nutritional distribution
nutrient utilization
allometric relationship
