Results 11 to 20 of about 1,167,373 (161)

若尔盖高寒湿地土壤活性有机碳垂直分布特征

open access: yesShuitu Baochi Xuebao, 2006
对若尔盖高寒湿地沼泽土和泥炭土的有机碳(TOC)和活性有机碳(LC)沿土壤剖面的分布特征研究表明,沼泽土的有机碳和全氮(TN)古量整体上从表层向下呈现下降趋势.中间在16~18cm处出现一个升高点,与当时的有机质来源和沉积环境有关。泥炭土有机碳沿土壤剖面并没有呈现同样的下降趋势.而是从表层向下至22cm呈现升高趋势,22cm向下才呈现下降趋势。全氮含量与有机碳含量的分布特征不同。在表层o~10cm古量较高,向下含量减小。沼泽土活性有机碳沿土壤剖面整体呈现下降趋势,变化于2.4~13.6mg/g ...
高俊琴, 欧阳华, 白军红
doaj   +1 more source

土地利用与反季节水位波动影响下土壤活性有机碳的组分特征

open access: yesShuitu Baochi Xuebao, 2021
为了研究消落带不同土地利用类型和水淹强度下土壤活性有机碳组分特征及其主要的影响因子,选取不同海拔高程(水淹强度)与不同土地利用类型的消落带土壤为研究对象,定量解析土地利用方式与水淹强度对三峡水库消落带土壤活性有机碳组分的影响,并分析土壤活性有机碳与土壤理化性质之间的关系。结果表明,消落带土壤活性有机碳含量总体上随着水淹强度的增强而减小。土地利用、水淹强度及其交互作用对土壤活性有机碳影响的解释度分别为22.1%,13.7%,9.3%;土壤微生物生物量碳主要受土地利用、土地利用与淹水强度交互作用的影响 ...
李文娟   +4 more
doaj  

保护性耕作下土壤碳库管理指数的研究

open access: yesShuitu Baochi Xuebao, 2006
以保护性耕作长期定位试验为研究对象,分析了保护性耕作对土壤不同层次的总碳、活性碳的影响,并计算了各处理的碳库活度、碳库活度指数和碳库管理指数。结果表明,土壤总有机碳和活性碳均随土层的增加而减少,其0~30cm平均总有机碳含量大小为旋耕〉免耕〉翻耕〉对照,秸秆还田提高土壤耕层总有机碳,旋耕和免耕提高表层土壤有机碳.且差异达到显著水平;土壤活性碳平均含量为旋耕〉翻耕〉对照〉免耕,旋耕和翻耕提高土壤活性碳,免耕则降低土壤活性碳,尤其是10~20cm土层活性碳比旋耕下降了27.33%。华北平原0 ...
李琳, 李素娟, 张海林, 陈阜
doaj   +2 more sources

长期覆膜旱地苹果园表层土壤“隐性”退化下活性有机碳与酶活性差异

open access: yesShuitu Baochi Xuebao, 2021
为探明陇东旱塬雨养农业区旱作节水措施下黄绵土物理稳定性机制和化学活性机制,揭示表层土壤有机碳贮存对土壤物理"隐性"退化的响应机制。以陇东旱塬区不同覆膜年限(2,4,6年)的苹果园表层土壤(0—20 cm)为对象,对土壤物理性状、质地分级进行判断,监测微生物量碳(MBC)、易氧化有机碳(EOC)、颗粒有机碳(POC)、可溶性有机碳(DOC)等指标的动态变化,表征土壤有机碳变化趋势,借助β-1,4-木糖苷酶(βX)、β-1,4-葡萄糖苷酶(βG)、纤维二糖水解酶(CBH)活性表征土壤碳代谢循环特性 ...
孙文泰   +5 more
doaj  

Land use overrides climatic controls on soil organic nitrogen transformations: Contrasting responsiveness between forest and cropland ecosystems

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Soil organic nitrogen (SON) transformation is critical for global nutrient cycling and ecosystem productivity, yet how its responsiveness to climate change differs across diverse land use types remains poorly resolved.
Xinyi Yang   +10 more
wiley   +1 more source

土壤不同形态碳氮含量和酶活性对培养时间及外源碳投入的响应

open access: yesShuitu Baochi Xuebao, 2020
在绿色农业科技的推动下,有机物料资源化利用备受青睐,但有机物料种类不同对土壤肥力的提升效果不同,为探究有机物料施用对潮土不同形态碳氮含量及酶活性的动态影响,通过为期1年的培养试验,设置添加10 g/kg的秸秆菌渣(S)、树枝菌渣(B)、小麦秸秆(W)、黑麦草秸秆(R)和蚕豆秸秆(BB),并以空白处理作为对照(CK)。结果表明:与CK相比,有机物料施用显著增加土壤不同形态碳氮含量及酶活性,随培养时间的延长,有机碳及全氮含量呈增加的趋势,增幅分别为25.4%~42.9%和35%~60 ...
杨苏   +6 more
doaj  

Conservative roots confer a larger microbial carbon pump efficacy than acquisitive roots by regulating microbial life‐history strategy

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Root activity creates unique microbial hotspots in the rhizosphere by influencing the metabolic activities of surrounding soil microorganisms, profoundly regulating the dynamics of soil organic carbon (SOC). However, how root economic strategies affect the formation and
Qiyu Tan   +8 more
wiley   +1 more source

Alleviation of phosphorus rather than nitrogen limitation driven by permafrost and landscape effects on Dahurian larch forests

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Permafrost thaw is reshaping nutrient dynamics in boreal forests, but its impacts on tree nutrient limitation and functional strategies remain poorly understood. Clarifying these responses is crucial for predicting the response of boreal forests to climate change.
Qiyue Fu   +9 more
wiley   +1 more source

长期施肥对稻麦轮作紫色土有机碳组分及酶活性的影响

open access: yesShuitu Baochi Xuebao, 2022
为了探明西南地区长期不同施肥处理对稻麦轮作紫色土有机碳组分和碳循环相关水解酶活性的影响,依托重庆北碚29年稻麦轮作紫色土长期定位试验,选取不施肥(CK)、单施氮磷钾肥(NPK)、有机无机配施(NPKM)、秸秆还田配施含氯化肥[(NPK)ClS]和秸秆还田配施无机肥(NPKS)5个处理,测定土壤各组分有机碳含量及与土壤碳循环相关的水解酶活性并分析两者间的相关性。结果表明:长期施肥(NPK、NPKM和NPKS)显著提高土壤总有机碳和不同组分有机碳含量,各施肥处理土壤总有机碳含量较CK提升11.6%~40.2%
徐文静   +7 more
doaj  

Scientists’ warning on the global destruction of rock outcrop ecosystems

open access: yesConservation Biology, EarlyView.
Abstract Rock outcrops are geological formations that harbor a highly specialized biota adapted to harsh environmental conditions that differ from their surrounding landscapes. They are globally distributed, especially in old, highly weathered landscapes, and can function as habitat islands containing high levels of endemism and distinct evolutionary ...
Luiza F. A. de Paula   +19 more
wiley   +1 more source

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