Nitrification (with ammonia oxidation as its rate-limiting step) mediated by BSC microbes is another important component of arid land nutrient cycling that directly impacts soil fertility and rivals N-fixation in its magnitude (Johnson et al.2005).2005
Besides the role of land nutrient discharge, the nutrient concentration variations of coastal marine waters can also be related to oceanic sources, as in the case of areas subject to coastal upwelling events (Matsuura 1986; Gonzalez-Rodriguez et al. 1992; Valentin et al. 1994; Simonassi et al. 2010).
However, on both the privately and communally managed range-lands, soil nutrient and water infiltration status, rock cover, soil alkalinity, salinity and total N content were significantly greater at low than high and/or medium altitudes.
Its natural subsystem consists of Chinese traditional five elements: metal (minerals), wood (living organism), water, fire (energy) and soil (nutrients and land).
As Jatropha is targeted to be grown in marginal land where soil nutrient is low, the requirement for nitrogen fertilizer will be higher than other crops.
Therefore, community-based soil and water conservation practice is a dependable rehabilitation or restoration approach, which helps to boost the arbuscular mycorrhizal fungi and soil nutrients in degraded lands.
Ornithogenesis is viewed as a mechanism of sea-land nutrient transfer, enriching the latter, since the parent rocks are chemically poor sedimentary materials.
Characterizing spatial variability of soil nutrients in relation to site properties, including climate, land use, landscape position and other variables, is important for understanding how ecosystems work and assessing the effects of future land use change on soil nutrients.
A more nuanced approach should, therefore, take into considerations of the spatial diversities in soil nutrient stocks and land use practices, which are factors driving crop demand for soil nutrients (Elias 2016).
This would lead to over exploitation of the land through nutrient mining and nutrient depletion (Hartemink 2006).
