Results 41 to 50 of about 818 (152)

施氮量对冬小麦—夏玉米土壤氮素表观盈亏的影响

open access: yesShuitu Baochi Xuebao, 2018
通过河北清苑连续6年的田间定位试验,以冬小麦—夏玉米轮作体系作为对象,设置不同的施氮处理(N0、N100、N180、N255、N330),研究不同施氮量对冬小麦—夏玉米轮作体系的土壤氮素表观盈亏的影响。结果表明:6年土壤表观氮素累积盈亏量随施氮量的增加而增加,N0和N100处理的土壤氮素累积盈亏量为负值,N180、N255和N330处理的土壤氮素累积盈亏量分别高达382,1 173,2 116 kg/hm2;各处理的氮素表观盈亏量年际间变异较大,而在2种作物上的氮素累积盈亏量差异不大 ...
辛思颖   +5 more
doaj  

棉花品种间土壤Nmin异同及氮肥推荐技术研究 [PDF]

open access: yes, 2007
在滴灌条件下,利用流动分析仪测定基因型差异较大的陆地棉和海岛棉在不同施氮水平下,各主要生育期0~60 cm土壤无机氮含量,对土壤氮素营养诊断及氮肥推荐技术基因型间的异同进行试验研究。结果表明:不同棉花品种0~20 cm土壤Nmin含量与施氮量和产量均有显著的正相关关系,采样深度增加相关性降低,品种间基肥和追肥总量氮肥推荐指标差异不显著,可采用同一标准。但由于2个品种各时期吸收氮的能力不同,不同品种主要生育时期最佳供氮量,植株全氮含量和收获后0~60 ...
仲桂军, 冯固, 田长彦, 马英杰
core  

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

缓释尿素对两种土壤小麦氮素运转、产量和土壤无机氮的影响

open access: yesShuitu Baochi Xuebao, 2018
为探明缓释尿素与普通尿素掺混比例对安徽小麦花后氮素运转特征和土壤氮素盈余的影响,分别选择安徽省北方小麦产区小麦—玉米轮作和南方小麦产区小麦—水稻轮作方式,土壤类型分别为两合土和黄棕壤,设置不施氮肥处理(CK)、农民习惯处理(Ncon)、减少普通尿素用量的优化氮素处理(Nopt)、缓释尿素及其掺混普通尿素处理(SRU1、SRU2、SRU3)和普通尿素全部基施处理(SRU4),分析了不同施肥处理在两种土壤上小麦花后氮素转运、产量、氮肥利用率和土壤无机氮积累量。结果表明:与黄棕壤比较 ...
袁嫚嫚   +5 more
doaj  

Denitrification Determination in soil of Wu Chuan Agricultural Catchment and the Control Measure [PDF]

open access: yes, 2007
反硝化作用是土壤氮素转化的一个重要过程,为探明五川流域内的农业土壤的反硝化作用强度及其影响因素,利用乙炔抑制-原状土柱培养法对其进行测定。通过3次试验测定,发现五川流域农业土壤具有较强的反硝化作用强度,在种植季节,土壤平均反硝化作用强度为0.1kgN·hm-2·d-1,最高达到0.6kgN·hm-2·d-1,其中蔬菜地反硝化作用强于其他土地利用类型。反硝化作用同土壤的NO3-含量、含水量、温度以及pH都存在正相关关系,它们是流域土壤反硝化作用的主要影响因子 ...
徐玉裕   +5 more
core  

Greenhouse Gas Mitigation and Yield Response to Biochar-Microbial Amendment in Saline-Alkali Soil [PDF]

open access: yes
[Objective] To investigate the effects of combined application of biochar and microbial fertilizer on greenhouse gas emissions and sunflower yield in saline-alkali soil under plastic film mulching and drip irrigation.
JI Wentao   +6 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

Nitrogen mineralization and denitrification in bamboo riparian systems in Southeastern China [PDF]

open access: yes, 2011
采用原位培养法和乙炔抑制-静态土柱培养法,对南方丘陵地区竹林河岸系统的矿化、反硝化作用进行了研究.结果表明,研究区土壤氮矿化速率为-0.28~0.30Mg·kg-1·d-1(以n计,下同),且与土壤含水量存在显著正相关(P河岸入口>河岸中部,并呈现出较大的时空差异.硝化和反硝化过程存在较强的耦合作用.较河岸区入口处和中部区而言,毗邻河道的河岸区的生物地球化学过程更为活跃.In situ nitrogen mineralization and denitrification rates in top ...
方婧, 曹文志, 苏彩霞
core  

Response of Microbial Community Structure and Diversity to Nitrogen Deposition in Soils of Pinus yunnanensis Forest of the Central Yunnan Plateau [PDF]

open access: yes
[Objective] To study the characteristics of changes in chemical properties and diversity and structural composition of soil microbial communities in Pinus yun-nanensis soils on the Central Yunnan Plateau under nitrogen deposition, and to analyze the ...
DENG Qiujiang   +6 more
core   +1 more source

我国生物地理学研究进展 [PDF]

open access: yes, 2009
生物地理学研究是生物学和地理学交叉非常明显的部门自然地理学学科,它具有很强的基础研究特点,同时研究成果也具有很大的应用潜力。近年来,我国生物地理学基础研究在国家自然科学基金委等部门的支持下,在山地植被与地理环境、干旱半干旱区植被与地理环境、植物区系、植物物候、土壤动物与土壤生态功能、土壤生物结皮等方面开展了全面而深入的研究。同时拓展了传统生物地理学的研究方向,在植物地理学与全球变化、植物地理学与生物多样性保护、植物地理学与生态系统管理等方面也开展了大量研究。尤为可贵的是干旱半干旱区土壤生物结皮研究 ...
冷疏影   +8 more
core  

Home - About - Disclaimer - Privacy