Carbon and Nitrogen Pools of Southern High Plains Cropland and Grassland Soils

Abstract

tration studies also examined total soil N (Bauer and

Changes in soil carbon and nitrogen pools after shifting from conventional cereal to greenhouse vegetable production

“…The wet soil was cleaned with deionized water until the solution pH was above 6 and oven-dried at 60 8C. POM was determined as described by Bronson et al (2004). Briefly, 25 g air-dried soil was dispersed in 100 ml of sodium hexametaphosphate solution (5 g L À1 ) for 1 h on a reciprocal shaker and the suspension was washed over a 53 mm sieve until the rinsing water was clear.…”

Organic carbon, nitrogen pool and microbial abundance indifferent rice soils of Manipur valley, India

“…The regression equation between NH 4 -N and oxidizable OC (Figure 4) showed that, the minimum observed value of oxidizable OC was 0.1652 g/kg and increase with 0.3896 mg/kg for every unit increase in NH 4 -N. The NO 3 -N content was found to be positively correlated with oxidizable OC (r = 0.335*), total-N (r = 0.480**) and NH 4 -N (r = 0.818**) content of the soils. Bronson et al (2004) registered that, the potentially mineralizable N concentration was correlated with total soil N concentration (r = 0.73) to a similar degree as potentially mineralizable C was correlated with total soil C concentration (r = 0.70). And potentially mineralizable N concentration was moderately correlated with potentially mineralizable C (r = 0.56).…”

“…However, the effect of this change in the soil microbial community on soil N transformation, especially the interactions of the soil fungal community with plant growth are not known . Nitrogen fractionation during mineralisation is controlled by carbon (C) and the N availability to the soil by microbial community (Dijkstra et al, 2006(Dijkstra et al, , 2008.They are also important for understanding the processes of soil C sequestration (Bronson et al, 2004). We attempted to assess the underlying relations of OC with different pools of N and to understand better how topographic change, variation in soil water submergence, and low soil acidity affect the diversity of microbial communities in rice soils.…”

Rural land management impacts on catchment scale flood risk

“…Land Use Change Change in Bulk Density Bauer and Black (1981) Grassland to Crops 5-20% increase (depth dependent Bewket and Stroosnijder (2003) Forest to Crops 13% increase Breuer et al, (2006) Crops to Grassland No significant changes Bronson et al, ( 2004) Grassland to Crops 3-21% increase (depth dependent) Franzluebbers et al, (2000) Grassland to Crops 3-17% increase (depth dependent) Murty et al, (2002) Forest to Grassland Forest to Crops 9.5% (± 2%) increase 17% (± 2%) increase Neill et al, (1997) Forest to Grassland 0-27% increase Strebel et al, (1988) Crops to Grassland 15% increase (upper soil layer) …”