Sympatric coastrange sculpin, Cottus aleuticus, and prickly sculpin, C. asper, occupied distinct habitats in the mainstem Smith River, northwestern California. For example, 90% of coastrange sculpin (n = 294) used habitat with water velocity > 5 cm s, whereas 89% of prickly sculpin (n = 981) used habitat with water velocity ≤ 5 cm s. Sixty-five percent of coastrange sculpin were found at depths...

Trees in cropped fields may improve nitrogen (N) use efficiency by intercepting leached N, but crop yield will be reduced if the trees compete strongly with crops for N. Ideal trees for intercropping will take up N from deeper soil layers not accessed by the crop species. Spatiotemporal aspects of tree nitrogen capture niches were investigated within a hedgerow intercropping system by placing 1...

Orchard grass cultivation management is an effective measure to safeguard the sustainable development of fruit industry in China. However, details influence natural sod culture on carbon (C)–nitrogen (N) nutrition trees and quality Hanfu apple orchards are lacking. Therefore, a field experiment was conducted, which consisted two treatments: clean tillage (CT) (NG). Results revealed that NG trea...

this study was carried out to investigate the effect of crown canopy of ziziphus spina-christi on seed bank characteristics (density and similarity with above ground flora) in two sites with saline-alkaline and alkaline soils. in each soil, forty plots were established, half in and half outside of z. spina-christi cover. in each plot, soil sampling was done from 0-5 and 5-10 cm depths. paired a...

Numerous applications in agriculture, climate, ecology, hydrology, and the environment are severely constrained by lack of detailed information on soil texture. The purpose this study was to predict particle-size fractions (PSF) Ri-Bhoi district Meghalaya state, India, using a random forest model (RF). For modeling fractions, we employed 95 profiles (456 depth-wise layers) gathered from recent ...

The perennial stoloniferous herbaceous vine Mikania micrantha H.B.K. is among the most noxious exotic invaders in China and the world. Disturbance can fragment stolons of M. micrantha and disperse these fragments over long distances or bury them in soils at different depths. To test their regeneration capacity, single-node stolon fragments with stolon internode lengths of 0, 3, 6 and 12 cm were...

Abstract A field study was carried out in Nagari Aie Dingin, Lembah Gumanti District, Solok Regency. This research aimed to examine the physical properties of Inceptisols at several slope levels location. The soil samples were taken by purposive sampling based (slightly steep [8-15%], moderately [15-25%], [25-45%], and very [>45%]), coffee (25-45%) for two depths (0-30 cm 30-60 cm). results ...