DOI: 10.3724/SP.J.1258.2012.00530

Chinese Journal of Plant Ecology (植物生态学报) 2012/36:6 PP.530-538

Impacts of different land use types on soil nitrogen mineralization in Danjiangkou Reservoir Area, China

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

ReleaseDate:2014-07-21 16:29:39

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