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对晋西北黄土高原丘陵区杨树-小叶锦鸡儿人工林、小叶锦鸡儿人工灌丛、杨树人工林、撂荒地和农田5种土地利用方式下土壤碳氮储量进行研究.结果表明:不同土地利用方式下土壤碳氮含量、碳氮密度和碳氮储量存在显著差异.5种土地利用方式0~20 cm表层土壤碳氮含量和碳氮密度均显著大于20~40 cm和40~60 cm土层.5种土地利用方式同一土层碳氮含量和碳氮密度大小为:杨树-小叶锦鸡儿人工林>小叶锦鸡儿人工灌丛>杨树人工林>撂荒地>农田;0~60 cm土层土壤有机碳储量大小为:杨树-小叶锦鸡儿人工林(30.09t·hm-2)>小叶锦鸡儿人工灌丛(24.78 t·hm-2)>杨树人工林(24.14 t·hm-2)>撂荒地(22.06 t·hm-2)>农田(17.59 t·hm-2);土壤氮储量与有机碳储量变化规律相似,杨树-小叶锦鸡儿人工林0~60 cm土层土壤氮储量(4.94 t·hm-2)最高,其次是小叶锦鸡儿人工灌丛(3.53 t·hm-2)、杨树人工林(3.51 t·hm-2)和撂荒地(3.40 t·hm-2),农田土壤氮储量(2.71 t·hm-2)最低.杨树-小叶锦鸡儿人工林和小叶锦鸡儿人工灌丛是晋西北黄土高原丘陵区植被建设和生态恢复过程中较好的两种土地利用方式.
The soil carbon and nitrogen storage of poplar-Caragana microphylla plantation, Caragana microphylla plantation, poplar artificial plantation, fallow land and farmland in the hilly region of Loess Plateau in Northwest Shanxi Province were studied.The results showed that: There were significant differences in soil C and N, C and N and C and N under the different utilization patterns.The soil carbon and nitrogen contents and C and N densities of 0 ~ 20 cm in the five land use patterns were significantly higher than those in 20 ~ 40 cm and 40 ~ 60 cm soil Layer.Carbon and nitrogen contents and carbon and nitrogen density in the same soil layer of five kinds of land use were: poplar-Caragana microphylla plantation> Caragana microphylla plantation> poplar plantation> abandoned land> farmland; 0-60 cm Soil organic carbon storage in the soil layer was as follows: poplar-Caragana microphylla plantation (30.09 t · hm -2)> Caragana microphylla plantation (24.78 t · hm -2)> poplar plantation (24.14 t · hm -2)> wasteland (22.06 t · hm-2)> farmland (17.59 t · hm-2). The soil nitrogen storage was similar to that of organic carbon storage. Poplar-Caragana microphylla plantation 0 ~ 60 cm soil layer The soil nitrogen storage (4.94 t · hm-2) was the highest, followed by artificial Caragana microphylla (3.53 t · hm-2), poplar plantation (3.51 t · hm-2) The wasteland (3.40 t · hm-2) and farmland soil nitrogen reserves (2.71 t · hm-2) were the lowest.The poplar-Caragana microphylla plantations and Caragana microphylla shrubs were the vegetation construction and ecology in the hilly area of Loess Plateau in Northwest Shanxi Province The better two kinds of land use in recovery process.