Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2020-06-27 Cooperative journals: 《干旱区研究》
Abstract：基于新疆喀什噶尔河流域平原区2014年74组地下水水质检测结果，运用克里格插值法、Gibbs图、离子比值法、矿物饱和指数法，揭示地下水中TDS分布特征及其成因。结果表明：研究区潜水中TDS介于354.80~6505.00 mg·L-1，平均值为1 994.36 mg·L-1，无盐水分布，总体表现为西高东低，水化学类型主要为SO4·Cl-Na·Ca·Mg、HCO3·SO4-Na·Ca·Mg和HCO3·SO4-Ca·Mg；承压水中的TDS普遍较高，介于214.00~14 548.00 mg·L-1，平均值为2 480.30 mg·L-1，其分布特征总体表现为南高北低，水化学类型以SO4·Cl-Na·Ca·Mg、HCO3·SO4-Na·Ca·Mg及SO4-Na·Ca·Mg为主。控制本区地下水TDS的主要机制为自然地理因素、岩石风化作用、蒸发浓缩作用、矿物溶解作用及人类活动。
Subjects: Biology >> Botany >> Applied botany submitted time 2018-09-07 Cooperative journals: 《广西植物》
Abstract： Exotic invasive plants can alter ecosystem and displace the native plants by releasing allelochemicals to the surrounding environment by means of leaching, natural volatilization, root exudation and plant litter decomposition. In this study, Vicia faba seeds were treated with different concentrations of Eupatorium adenophorum leaf aqueous extracts. The effects of Eupatorium adenophorum leaf aqueous extracts on the micronucleus, chromosome aberration, apoptosis, chlorophyll and N content and photosynthetic physiological characteristics of Vicia faba were studied in this paper. The results were as follows: (1) the treatment of Eupatorium adenophorum leaf aqueous extracts significantly inhibited the root tip elongation and cell mitosis of Vicia faba, and induced chromosome aberration and cell micronucleus in the root tip cells of V. faba. With the increasing concentration of leaf water extracts, mitosis index significantly decreased and micronucleus rate of root tip cells significantly increased. In addition, the treatment of high concentration leaf aqueous extracts significantly affects apoptosis and necrosis of V . faba root tip cells. (2) the content of chlorophyll and N in leaves of V . faba decreased significantly, and the maximum net photosynthetic rate and biomass of V. faba seedlings were significantly decreased. In conclusion, Eupatorium adenophorum leaf aqueous extracts may cause the oxidative damage oftheroottipofViciafabaand theelongationoftheroot tip,andtheinhibitoryeffect ofleafwater extract shows a certain dose effect.At the same time, the damage and inhibition effect of Eupatorium adenophorum leaf aqueous extracts on the root tip of Vicia faba may affect the uptake of nitrogen, and thus have a significant negative effect on the photosynthetic physiological performance and biomass accumulation of broad bean seedlings. The results reveal the mechanism of Eupatorium adenophorum leaf aqueous extracts, and promote the understandingpotentialimpactofexoticinvasiveplantsonagriculturalproduction.
Subjects: Biology >> Ecology submitted time 2018-05-18 Cooperative journals: 《生态学报》
Abstract：克隆整合被认为是克隆植物维持生态优势的重要手段，其通过分株间生理整合缓解资源异质性带来的压力。文章以根状茎克隆植物白夹竹（Phyllostachys bissetii）为研究对象，探讨异质性光照下克隆整合对白夹竹分株根际土壤细菌生物特征的影响。白夹竹克隆片段包含一个近端分株（proximal ramet）和一个远端分株（distal ramet），近端分株或远端分株分别置于80%遮荫环境，另一分株置于全光照环境；同时，分株间根状茎保持连接或割断处理。研究结果表明，不论白夹竹克隆片段近端分株遮荫还是远端分株遮荫，克隆整合均显著促进了遮荫分株根际土壤溶解性有机碳（DOC）含量和微生物生物量碳、氮含量（MBC，MBN）；根状茎连接条件下遮荫分株根际土壤胞外N-乙酰基-β-氨基葡萄糖苷酶（NAGase）、脲酶（Urease）活性显著高于根状茎割断处理的遮荫分株；对遮荫分株根际土壤基因组DNA的16S rDNA V3、V4可变区的测序结果表明，可操作分类单元（OTUs）归于13个门，415个属。与根际土壤氮素转化相关的菌群Nitrosomonadaceae（uncultured），Nitrospira，Nitrospinaceae（uncultured），Xanthobacteraceae（uncultured），Bradyrhizobium相对丰度较小（最高值为11.8%）。基于OTUs的主成分分析（PCA）表明，根状茎割断处理并没有对遮荫分株根际土壤细菌生物群落结构产生显著性影响。克隆整合显著促进了遮荫分株根际土壤C有效性，进而刺激了微生物调控的土壤有机质（SOM）周转过程。克隆整合对异质生境下克隆植物土壤细菌生物特征的影响可能部分解释了克隆植物的生态优势。
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