Results 21 to 30 of about 772 (149)

Rhizosphere Soil Nutrient and Enzyme Activity in Mixed Forest of Casurina Equisetifolia and Pinus elliotti [PDF]

open access: yes, 2006
对木麻黄湿地松混交林的根际土壤养分及酶活性进行测定,结果表明:混交林根际与非根际土壤pH值均呈下降,加剧了土壤酸化。速效钾除外,混交林中木麻黄根际各种矿质养分含量都小于对应的纯林;土壤阳离子交换总量减小,土壤营养贮量和养分供应能力有所下降。多酚氧化酶除外,根际土壤脲酶、磷酸酶、过氧化物酶活性混交林中小于纯林。混交后木麻黄在促进湿地松生长的同时可能对自身的生长不利,在沿海沙地营造木麻黄湿地松混交林,两树种均对土壤养分的过量索取可能会加剧地力的退化。Soil chemical properties and ...
侯杰   +5 more
core  

钙质钝化材料对四川盆地6种主要旱作土壤Cd的钝化效应

open access: yesShuitu Baochi Xuebao, 2023
为针对性、定量化地利用钝化处理实现不同类型Cd污染土壤的安全利用,以四川盆地6种主要旱作土壤为研究对象,采用室内培养试验和土培试验探讨了6个剂量水平下,钙质钝化材料对土壤pH、CEC、有效Cd含量、Cd形态、小白菜生物量和Cd含量的影响。结果表明:(1)钙质钝化材料可提升6种土壤的pH和CEC,土壤CEC随用量的增加而持续增加,而土壤pH在提升至微碱性水平后,不再随用量的增加而增加;(2)6种土壤有效Cd含量随钝化材料用量的增加先显著降低,后趋于平稳,用量>2.5%后均无显著变化。该添加量下 ...
陈兰   +4 more
doaj  

Plant–microbe interactions drive the rhizosphere microbial assembly and nitrogen cycling in a subtropical forest

open access: yesFunctional Ecology, Volume 39, Issue 5, Page 1274-1287, May 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Interactions between plants and soil microorganisms in the rhizosphere are vital for maintaining the nutrient cycle and stability of terrestrial ecosystems. Nitrogen, closely related to carbon (C) cycling and ecosystem productivity, undergoes transformation by soil ...
Ru Wang   +9 more
wiley   +1 more source

Evaluation of the Effectiveness of Soil Improvement Measures in Apple Orchards on the Loess Plateau: A Meta-Analysis [PDF]

open access: yes
[Objective] Soil acidification, structure and fertility degradation and poor water-holding capacities are common problems in the apple orchard on the Loess Plateau, effective soil improvement techniques are crucial for enhancing soil quality, and ...
DUAN Shunxia   +3 more
core   +1 more source

Plant nutrient‐acquisition strategies contribute to species replacement during primary succession

open access: yesJournal of Ecology, Volume 113, Issue 4, Page 988-1003, April 2025.
Pioneer species Hippophae acquires phosphorus and nitrogen mainly by ‘mining’ and N2‐fixing strategies and thus dominates in the beginning of primary succession. As soil nutrient availability increases with the mobilization of apatite‐P and input of N‐rich plant residues, Hippophae' strategies become less efficient than Populus's scavenging strategies.
Xiao‐Long Li   +12 more
wiley   +1 more source

生物炭对不同酸化水平稻田土壤性质和重金属Cu、Cd有效性影响

open access: yesShuitu Baochi Xuebao, 2020
针对南方稻田土壤酸化严重,导致养分流失有毒重金属活化,严重影响稻米质量安全的重大现实问题。以水稻秸秆和谷壳等农业废弃物为原料制备生物炭(分别记为RSC和RHC),研究不同原料生物炭对酸化土壤改良及其对重金属有效性的影响。设置3个生物炭用量(0,20,50 g/kg,分别记为CK、C1、C2),4种土壤酸化水平(pH 4.01,4.25,4.33,4.58,分别记为L1、L2、L3、L4),生物炭与重金属污染土壤共同培养60天后测定土壤pH、全氮、有机质、有效磷、速效钾和有效态Cu、Cd含量。结果表明 ...
陈乐   +6 more
doaj  

Changing plant phosphorus acquisition strategies in relation to altered soil phosphorus fractions after wetland drainage

open access: yesFunctional Ecology, Volume 38, Issue 11, Page 2433-2446, November 2024.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phosphorus (P) acquisition strategy is considered to be an intrinsic driver behind plant succession. However, variations in plant P acquisition strategies in connection to soil P fraction changes after wetland drainage remain unclear.
Zhenhui Jiang   +6 more
wiley   +1 more source

Calcuim depletion in forest ecosystem induced by acid rain: a review [PDF]

open access: yes, 2010
通讯作者Corresponding author. E2mail: zhenghl@xmu. edu. cn[中文文摘]酸雨作为一个全球性环境问题,随着我国经济的快速发展,其危害也日益严重。诸多长期观测研究认为酸雨导致森林生态系统营养流失,特别是Ca的流失是酸雨导致森林衰退的一个重要原因。长期酸雨影响下,土壤中的Ca大量流失,在红壤等酸性土壤中表现得尤为严重;此外酸雨也会直接淋溶出植物叶片中的Ca,造成林冠中Ca不同程度的淋溶流失,并可能造成叶片Ca含量下降。且酸雨会导致叶片细胞内Ca稳态的失衡 ...
刘廷武   +3 more
core  

Comparative Proteomic Analysis of Arabidopsis thaliana Root in Response to Calcium under Aluminum Stress [PDF]

open access: yes, 2011
近年来,酸雨已成为世界重大环境问题,它加速了土壤酸化,使土壤铝会以各种离子型态释放进入土壤溶液,对植物产生毒害。如今,铝毒已经成为一个世界性的限制酸性土壤上植物生长的主要因子。 钙对植物的生长具有重要的意义。许多的研究表明,钙能够缓解铝胁迫,但缓解的机制尚不清楚。目前对钙缓解铝胁迫机制的研究主要集中在Ca和Al的竞争性取代以及生理水平,但蛋白分子水平的研究几为空白。本实验以模式植物拟南芥(Arabidopsisthaliana ...
段瑞雪
core  

Effects of calcium depletion caused by acid deposition on several forest tree species in southern China [PDF]

open access: yes, 2012
随着经济的高速发展,SO2和NOx排放急剧增加,酸沉降问题日益严重,并且在将来很长一段时间内都是我国难以回避的重要环境问题。 在北美和欧洲的许多长期观测研究认为酸雨导致森林生态系统营养元素大量流失,特别是钙(Ca)的流失是酸雨导致森林衰退的一个重要的原因。但由于中国酸沉降具有高Ca2+含量的特点,沉降通量较欧美地区高出几倍到几十倍,因此目前对中国森林生态系统中Ca流失所带来的影响及危害还研究的不多。 本研究项目通过野外观测和室内模拟控制实验,较为系统的研究了中国主要的森林植物物种在酸沉降下的响应 ...
吴飞华
core  

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