余明:樟树(Cinnamomum camphora)幼苗细根形态对氮磷添加和幼苗密度的响应论文

余明:樟树(Cinnamomum camphora)幼苗细根形态对氮磷添加和幼苗密度的响应论文

本文主要研究内容

作者余明,蔡金桓,薛立(2019)在《樟树(Cinnamomum camphora)幼苗细根形态对氮磷添加和幼苗密度的响应》一文中研究指出:全球氮沉降对森林生态系统结构和功能的影响已成为现代生态学研究热点之一,我国华南地区氮沉降的增长引起了土壤酸化和磷限制加剧等一系列生态问题。密度制约着植物个体对环境资源的吸收利用,是自然界中十分重要的选择压力之一。因此研究樟树(Cinnamomum camphora)幼苗的细根形态对氮磷添加和密度的响应,有利于了解亚热带树木根系对氮沉降和磷添加与林分密度的响应过程和机制,并为全球变化背景下樟树林生态系统的管理提供依据。本研究以1年生樟树幼苗为试验材料,选择氯化铵(NH4Cl)作为氮肥以模拟大气氮沉降,并且以二水合磷酸二氢钠(NaH2PO4·2H2O)模拟磷添加,氮磷处理设置4个水平,即对照、施N、施P和施N+P;种植密度设置10、20、40和80株/m24个水平。测定各处理樟树幼苗细根的根长、表面积、体积和根尖数,分析氮磷添加、密度和两者交互作用对樟树幼苗细根的影响。研究结果表明,与对照处理相比,N、P和N+P处理促进了幼苗细根长度、表面积、体积以及根尖数的增加。低密度条件下的N添加对幼苗根系形态的促进效果强于P添加。N+P处理对10、20、40株/m2幼苗根系形态的促进效果最佳,而各处理对80株/m2幼苗根系形态的促进效果均无显著性差异。随着种植密度的增大,幼苗细根长度、表面积、体积和根尖数均减少。樟树幼苗的细根长度、表面积、体积和根尖数在各密度间和不同氮磷添加处理间均有显著性差异,密度和氮磷处理间的交互作用对根系形态各指标均无显著影响。

Abstract

quan qiu dan chen jiang dui sen lin sheng tai ji tong jie gou he gong neng de ying xiang yi cheng wei xian dai sheng tai xue yan jiu re dian zhi yi ,wo guo hua na de ou dan chen jiang de zeng chang yin qi le tu rang suan hua he lin xian zhi jia ju deng yi ji lie sheng tai wen ti 。mi du zhi yao zhao zhi wu ge ti dui huan jing zi yuan de xi shou li yong ,shi zi ran jie zhong shi fen chong yao de shua ze ya li zhi yi 。yin ci yan jiu zhang shu (Cinnamomum camphora)you miao de xi gen xing tai dui dan lin tian jia he mi du de xiang ying ,you li yu le jie ya re dai shu mu gen ji dui dan chen jiang he lin tian jia yu lin fen mi du de xiang ying guo cheng he ji zhi ,bing wei quan qiu bian hua bei jing xia zhang shu lin sheng tai ji tong de guan li di gong yi ju 。ben yan jiu yi 1nian sheng zhang shu you miao wei shi yan cai liao ,shua ze lv hua an (NH4Cl)zuo wei dan fei yi mo ni da qi dan chen jiang ,bing ju yi er shui ge lin suan er qing na (NaH2PO4·2H2O)mo ni lin tian jia ,dan lin chu li she zhi 4ge shui ping ,ji dui zhao 、shi N、shi Phe shi N+P;chong zhi mi du she zhi 10、20、40he 80zhu /m24ge shui ping 。ce ding ge chu li zhang shu you miao xi gen de gen chang 、biao mian ji 、ti ji he gen jian shu ,fen xi dan lin tian jia 、mi du he liang zhe jiao hu zuo yong dui zhang shu you miao xi gen de ying xiang 。yan jiu jie guo biao ming ,yu dui zhao chu li xiang bi ,N、Phe N+Pchu li cu jin le you miao xi gen chang du 、biao mian ji 、ti ji yi ji gen jian shu de zeng jia 。di mi du tiao jian xia de Ntian jia dui you miao gen ji xing tai de cu jin xiao guo jiang yu Ptian jia 。N+Pchu li dui 10、20、40zhu /m2you miao gen ji xing tai de cu jin xiao guo zui jia ,er ge chu li dui 80zhu /m2you miao gen ji xing tai de cu jin xiao guo jun mo xian zhe xing cha yi 。sui zhao chong zhi mi du de zeng da ,you miao xi gen chang du 、biao mian ji 、ti ji he gen jian shu jun jian shao 。zhang shu you miao de xi gen chang du 、biao mian ji 、ti ji he gen jian shu zai ge mi du jian he bu tong dan lin tian jia chu li jian jun you xian zhe xing cha yi ,mi du he dan lin chu li jian de jiao hu zuo yong dui gen ji xing tai ge zhi biao jun mo xian zhe ying xiang 。

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  • 论文详细介绍

    论文作者分别是来自生态学报的余明,蔡金桓,薛立,发表于刊物生态学报2019年20期论文,是一篇关于模拟氮磷沉降论文,密度论文,樟树论文,根系形态论文,生态学报2019年20期论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自生态学报2019年20期论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。

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    余明:樟树(Cinnamomum camphora)幼苗细根形态对氮磷添加和幼苗密度的响应论文
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