Chinese Journal of Plant Ecology (植物生态学报) 2012/36:6 PP.530-538
Aims Land use change may alter nitrogen (N) dynamics in terrestrial ecosystems, but its effects remain poorly quantified. Due to reorganization of the land use by government, a large cultivated area has converted to wood-land and shrubland plantation since the 1980’s in Danjiangkou Reservoir area, China. Our objective was to inves-tigate effects of agricultural land use change on soil N dynamics in this area. Methods We conducted in situ close-top tube incubation experiment to determine soil inorganic N (NH4+-N, NO3–-N), soil net nitrogen minerali-zation and nitrification in three adjacent land use types (afforestation, shrubland and cropland) in the Qingtang river basin around Danjiangkou Reservoir in Spring of 2011. Important findings Soil NO3–-N concentration (mg·kg–1) was 1.27 ± 0.18, 3.51 ± 0.11 and 9.00 ± 0.73 in afforestation, shrubland and cropland, respectively. Soil NO3–-N concentration significantly increased from afforestation to shrubland to cropland, whereas NH4+-N con-centration (mg·kg–1) was not significantly different among afforestation (1.33 ± 0.20), shrubland (1.67 ± 0.17) and cropland (1.62 ± 0.13). We found that NO3–-N was the main form of inorganic N under shrubland and cropland, and the proportion of NO3–-N to soil inorganic N content was 67.8% and 84.8% in shrubland and cropland, respec-tively; however, the concentration of NO3–-N was approximately equal to NH4+-N under afforestation. Soil net N mineralization rate (mg·kg–1·30 d–1) were 0.98 ± 0.12, 2.52 ± 1.25 and 6.58 ± 2.29, respectively in afforestation, shrubland to cropland. Soil net N mineralization rate was not significantly different among the land use types, whereas nitrification rate (mg·kg–1·30 d–1) was significantly different: cropland (7.13 ± 2.19), shrubland (2.56 ± 1.07) and afforestation (0.85 ± 0.10). Soil net N mineralization rate was positively correlated with nitrification rate. Nitrification rate accounts for approximately 87% of soil mineralization rate in afforestation, whereas nitrifi-cation was higher than mineralization rate in shrubland and cropland soil due to the ammonification rate being be-low zero. Both soil N mineralization and nitrification were regulated by soil water content and soil temperature with more sensitive to soil water content during the incubation period. Additionally, soil N mineralization and ni-trification were negatively correlated with soil C:N ratio. Our results suggest that change in soil microclimate and soil C:N ratio under land use change would impact soil N dynamics.
Key words：Danjiangkou Reservoir, land use type, net nitrogen mineralization rate, nitrification rate, soil inorganic nitrogen
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