نتایج جستجو برای: soil ratio

تعداد نتایج: 674745  

2013
Bin Zhang Chao Liang Hongbo He Xudong Zhang

Altitudinally-defined climate conditions provide specific vegetation types and soil environments that could influence soil microbial communities, which in turn may affect microbial residues. However, the knowledge is limited in terms of the degree to which microbial communities and residues present and differ along altitude. In this study, we examined the soil microbial communities and residues...

2016
Yong Li Jinshui Wu Jianlin Shen Shoulong Liu Cong Wang Dan Chen Tieping Huang Jiabao Zhang

Maintaining good soil productivity in rice paddies is important for global food security. Numerous methods have been developed to evaluate paddy soil productivity (PSP), most based on soil physiochemical properties and relatively few on biological indices. Here, we used a long-term dataset from experiments on paddy fields at eight county sites and a short-term dataset from a single field experi...

Journal: :Plant physiology 1988
J Masle G D Farquhar

The ratio of carbon accumulation to transpiration, W, of wheat (Triticum aestivum L.) seedlings increased with increasing soil strength, measured as soil penetrometer resistance, and this was already apparent at the two leaf stage. The ratio was negatively correlated with carbon isotope discrimination, in accord with theory. This means that decrease in intercellular partial pressure of CO(2) ac...

2017
Irena Ymeti Harald van der Werff Dhruba Pikha Shrestha Victor G. Jetten Caroline Lievens Freek D. van der Meer

Remote sensing has shown its potential to assess soil properties and is a fast and non-destructive method for monitoring soil surface changes. In this paper, we monitor soil aggregate breakdown under natural conditions. From November 2014 to February 2015, images and weather data were collected on a daily basis from five soils susceptible to detachment (Silty Loam with various organic matter co...

Journal: :Ecology 2009
Angela J Brandt Eric W Seabloom Parviez R Hosseini

Plant-soil feedbacks can affect plant community dynamics by influencing processes of coexistence or invasion, or by maintaining alternate stable states. Darwin's naturalization hypothesis suggests that phylogenetic relatedness should be a critical factor governing such feedbacks in invaded communities but is rarely considered in soil feedback studies. We investigated the effects of soil biota f...

Journal: :Applied and environmental microbiology 2015
Alexandre B de Menezes Miranda T Prendergast-Miller Pabhon Poonpatana Mark Farrell Andrew Bissett Lynne M Macdonald Peter Toscas Alan E Richardson Peter H Thrall

Cellulose accounts for approximately half of photosynthesis-fixed carbon; however, the ecology of its degradation in soil is still relatively poorly understood. The role of actinobacteria in cellulose degradation has not been extensively investigated despite their abundance in soil and known cellulose degradation capability. Here, the diversity and abundance of the actinobacterial glycoside hyd...

Journal: :Journal of economic entomology 2014
M Bernier V Fournier P Giovenazzo

The pupal development of Aethina tumida Murray (Coleoptera: Nitidulidae) was studied at various combinations of thermo-hygrometric soil conditions (temperatures of 16, 18, and 20 degrees C and soil water content levels of 0.37, 0.56, and 0.73 m3 water per cubic meter of dry soil) representative of southeastern Canada. Survivorship and development duration of A. tumida pupae, as well as sex rati...

2014

The study focussed on stabilizing potential of ash obtained from calcination of cattle bones from slaughter house in Ibadan. Cattle bones obtained were burnt in an open air. The residue was fed into furnace at about 1100 o C for four hours, allowed to cool, milled and sieved with sieve of aperture 75 micro metre to obtain bone ash (BA). The bone ash (BA) was used to stabilize four soil samples ...

2016
Wen Yang Nasreen Jeelani Xin Leng Xiaoli Cheng Shuqing An

The role of exotic plants in regulating soil microbial community structure and activity following invasion chronosequence remains unclear. We investigated soil microbial community structure and microbial respiration following Spartina alterniflora invasion in a chronosequence of 6-, 10-, 17-, and 20-year-old by comparing with bare flat in a coastal wetland of China. S. alterniflora invasion sig...

2001
C. ADAM SCHLOSSER P. C. D. MILLY

Soil moisture predictability and the associated predictability of continental climate are explored as an initialvalue problem, using a coupled land–atmosphere model with prescribed ocean surface temperatures. Ensemble simulations are designed to assess the extent to which initial soil moisture fields explain variance of future predictands (soil moisture, near-surface air temperature, and precip...

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