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[1]汪依妮 柳鑫 王健健 田思惠 田晓龙 赵学春,*.三工河流域不同植物群落细根对盐碱化的响应*[J].应用与环境生物学报,2018,24(06):1-11.[doi:10.19675/j.cnki.1006-687x.2018.01045]
 WANG Yini,LIU Xin,WANG Jianjian,et al.Response of the fine roots of different plants communities to salinity in the SangongRiver basin[J].Chinese Journal of Applied & Environmental Biology,2018,24(06):1-11.[doi:10.19675/j.cnki.1006-687x.2018.01045]
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三工河流域不同植物群落细根对盐碱化的响应*()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
24卷
期数:
2018年06期
页码:
1-11
栏目:
研究论文
出版日期:
2018-12-25

文章信息/Info

Title:
Response of the fine roots of different plants communities to salinity in the SangongRiver basin
文章编号:
201801045
作者:
汪依妮1 柳鑫1 王健健2 田思惠1 田晓龙1 赵学春1*
1贵州大学动物科学学院 贵阳 550025?
2贵州大学生命科学学院 贵阳 550025
Author(s):
WANG Yini1 LIU Xin1 WANG Jianjian1TIAN Sihui1 TIAN Xiaolong1 & ZHAO Xuechun1*
1 College of Animal Science of Guizhou university, Guiyang 550025, China2 College of Life Science of Guizhou university, Guiyang550025, China)
关键词:
荒漠植物群落盐碱化细根动态土壤因子
Keywords:
desert plants communities salinization and alkalinization fine dynamic soil factors
DOI:
10.19675/j.cnki.1006-687x.2018.01045
摘要:
采用连续土钻取样和分解袋分解法,对三工河流域5个不同盐碱化植物群落(琵琶柴群落、骆驼刺群落、沙枣群落、多枝柽柳群落、芦苇群落)整个生长季节的细根垂直分布、季节变化、分解动态、周转规律及其与土壤因子的关系进行研究。结果表明:细根生物量随土层深度的增加均呈现先增加后逐渐降低的趋势,除芦苇群落外,均在10-20 cm土层达到最大值;5个群落的细根生物量分别为51.55 g/m2、93.09 g/m2、146.24 g/m2、57.95 g/m2、419.34 g/m2,随季节变化均呈现先增加后降低的趋势,在8月或9月达到峰值;在5个月的细根分解试验中,5个群落的细根分解速率呈现快、慢、快三个明显的阶段,分解速率属Peterson划分的“慢组”;不同群落的细根死亡量、年分解量和净生产力差异显著,三者均表现为:芦苇群落>沙枣群落>骆驼刺群落>多枝柽柳群落>琵琶柴群落;5个群落的细根周转速率范围为1.41-1.98次/yr,高于陆地生态系统细根的周转速率0.56次/yr;逐步回归分析表明土壤pH、土壤电导率、土壤容重、土壤含水量是影响各变量的主要因子或共同主要因子,土壤pH是影响根系分布、分解和周转的最主要因素。因此,盐碱植物群落细根生物量小,分解慢而周转快,土壤水盐特征决定了细根的分布和动态。
Abstract:
Throughout the whole growing season (from May to Octomber 2010), sequential soil coring and ingrowth bag methods were adopted to investigate the vertical distribution, seasonal changes, decomposition dynamics, turnover of fine roots and their relationship with soil factors of five saline-alkali plant communities (Reaumuria soongonica Community , Alhagi sparsifolia Community , Elaeagnus angustifolia Community , Tamarix ramosissima Community , and Phragmites australis Community) in the Sangong River basin. Results showed that fine root biomass increased initially and thereafter decreased with soil layers deepened in the five studied communities, all fine root biomass reached the maximum in 10-20 cm soil layer exce pt Phragmites australis Community. Fine root biomass of all five communities increased initially and thereafter decreased from May to Octomber, reached the maximum at August or September, and their values were 51.55 g/m2, 93.09 g/m2, 146.24 g/m2, 57.95 g/m2 and 419.34 g/m 2, respectively. Fine root decomposition rate present three distinct “fast-slow-fast” phases in the five months` decomposition experiment, and all the five decomposition rates were divided into “slow group” of Peterson. Amount of fine root death, fine root decomposition and fine root productivity were significantly different, all communities showed Phragmites australis Community > Elaeagnus angustifolia Community > Alhagi sparsifolia Community > Tamarix ramosissima Community > Reaumuria soongonica Community . Range of fine root turnover rate was 1.41-1.98 times/yr in the five communities, and higher than the average value of 0.56 times/yr in terrestrial ecosystems. Stepwise regression analysis showed that soil pH, soil electrical conductivity, soil bulk density, and soil water content were the dominant factors or common dominant factors, and soil pH was the most important factor influnced the fine root distribution, decomposition and turnover. Therefore, saline communities have small fine root biomass, slow decomposition rate and fast turnover rate, soil water and salt determine the distribution and dynamics of fine roots.

备注/Memo

备注/Memo:
收稿日期: 2018-01-29 接受日期: 2018-03-06
*贵州省科技厅-贵州大学联合基金项目(黔科合LH字[2017] 7288号)、国家自然科学基金地区项目(31560670)、贵州大学人才引进项目(贵大人基合字[2014] 13号)项目资助?
**通讯作者(E-mail:xczhao@gzu.edu.cn)
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更新日期/Last Update: 2018-04-28