丛林式橡胶林内植物水分利用效率与叶片养分含量

doi:10.3969/j.issn.1009-7791.2019.02.005

亚热带植物科学 ›› 2019, Vol. 48 ›› Issue (02): 125-133.DOI: 10.3969/j.issn.1009-7791.2019.02.005

丛林式橡胶林内植物水分利用效率与叶片养分含量

曾欢欢，吴骏恩，刘文杰

(1.中国科学院热带森林生态学重点实验室／中国科学院西双版纳热带植物园，云南勐仑 666303；2.中国科学院大学，北京100049)

收稿日期:2018-12-04 修回日期:2019-03-05 出版日期:2019-06-27 发布日期:2019-06-27
通讯作者: 刘文杰
作者简介:曾欢欢，硕士研究生，从事生态水文研究。
基金资助:
国家自然科学基金项目(31570622)；国家博士后创新人才计划(BX201700278)

Water Use Efficiency and Leaf Nutrient Contents of Plants in Jungle Rubber Agroforestry System

ZENG Huan-huan, WU Jun-en, LIU Wen-jie

(1.Key Laboratory of Tropical Forest Ecology／Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun 666303, Yunnan China; 2.University of Chinese Academy of Sciences, Beijing 100049, China)

Received:2018-12-04 Revised:2019-03-05 Online:2019-06-27 Published:2019-06-27
Contact: LIU Wen-jie

摘要/Abstract

摘要： 选取西双版纳地区丛林式橡胶林为研究对象，以纯橡胶林为对照，分别在2016年干季(3月)和雨季(5、6、7月)进行取样，测定两个样地内植物叶片δ13C值，比较植物水分利用效率，测定叶片C、N、P含量，计算叶片N/P值，分析植物对养分的利用与竞争关系，并综合分析植物水分利用效率与养分之间的相关性。结果表明，干季橡胶树受到干旱胁迫，其水分利用效率显著高于雨季，此时叶片N、P含量也显著高于雨季；丛林式橡胶林内橡胶树水分利用效率低于纯橡胶林内橡胶树，叶片N、P含量和N/P值均高于纯橡胶林中橡胶树；两个样地内不同植物与不同时间的水分利用效率，叶片C、N、P含量和N/P值均存在显著差异；相关性分析表明，水分利用效率与叶片N、P含量呈正相关，与叶片C含量、N/P值呈负相关。因此，丛林式橡胶林内橡胶树能更好地应对干旱，具有较强的养分获取能力。该研究揭示了丛林式橡胶林内植物水分利用效率以及养分利用特征，表明丛林式橡胶林是一种值得推广的农林复合生态系统。

关键词: 胶农复合生态系统, 碳稳定同位素, 养分限制, 碳, 氮, 磷

Abstract: Jungle rubber is a rubber agroforestry ecosystem based on tropical rainforest structure that conforms to the thought of sustainable development rubber garden and has great potential applications, but the competition among plants for water and nutrients in jungle rubber is not clear. For these reasons we measured leaf δ13C, carbon(C), nitrogen(N) and phosphorus(P) contents of Hevea brasiliensis as well as the dominant species in jungle rubber and one rubber monoculture which is located at Xishuangbanna Tropical Botanical Garden in Southwest Yunnan Province, China in March 2016 (dry season) and May, June, July 2016 (rainy season) to analyze the relationship between the competition for water and nutrients in jungle rubber. We have got some results from collecting plant samples, laboratory test and statistical analysis method. In dry season H. brasiliensis were affected by drought stress, and their water use efficiency was significantly higher than that of rainy season. And the water use efficiency of H. brasiliensis in jungle rubber was lower than that in rubber monoculture, while the leaf N, P contents and N:P values were higher than those in rubber monoculture. There was significant difference among water use efficiency, leaf C, N, P content and N:P value of different time and different species in two study sites. Correlation analysis showed that the water use efficiency was positively correlated with the content of N and P in leaves but negative correlated with N/P value and C content in leaves. All above the results indicated that H. brasiliensis in jungle rubber got higher tolerance toward seasonal drought stress and stronger ability of nutrient acquisition than that in rubber monoculture. This study revealed the effects of planting pattern on the water use efficiency and nutrient absorption of plants, and proved that jungle rubber was a promising sustainable rubber agroforestry ecosystem.

Key words: rubber agroforestry ecosystem, carbon stable isotope, nutrient limitation, carbon, nitrogen, phosphorus

中图分类号:

S794.1

曾欢欢，吴骏恩，刘文杰. 丛林式橡胶林内植物水分利用效率与叶片养分含量[J]. 亚热带植物科学, 2019, 48(02): 125-133.

ZENG Huan-huan, WU Jun-en, LIU Wen-jie. Water Use Efficiency and Leaf Nutrient Contents of Plants in Jungle Rubber Agroforestry System[J]. Subtropical Plant Science, 2019, 48(02): 125-133.

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丛林式橡胶林内植物水分利用效率与叶片养分含量

Water Use Efficiency and Leaf Nutrient Contents of Plants in Jungle Rubber Agroforestry System

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