青藏高原人工草地土壤可溶性氮组分与植被生产力动态变化过程

刘攀, 王文颖, 周华坤, 毛旭锋, 刘艳方

Dynamics of soil soluble nitrogen and plant productivity in artificial pastures on the Qingzang Plateau

LIU Pan, WANG Wen-Ying, ZHOU Hua-Kun, MAO Xu-Feng, LIU Yan-Fang

表1 青藏高原人工草地土壤无机氮(IN)与可溶性有机氮(SON)含量的比例

Table 1 Proportion of soil inorganic nitrogen (IN) and soluble organic nitrogen (SON) in artificial pastures on the Qingzang Plateau

处理 Treatment 年龄Age (a) 0-10 cm土层 0-10 cm soil layer 10-20 cm土层 10-20 cm soil layer 铵态氮/ 可溶性总氮 NH4+-N/STN (%) 硝态氮/ 可溶性总氮 NO3--N/STN (%) 无机氮/ 可溶性总氮 IN/STN (%) 可溶性有机氮/可溶性总氮 SON/STN (%) 铵态氮/ 可溶性总氮 NH4+-N/STN (%) 硝态氮/ 可溶性总氮 NO3--N/STN (%) 无机氮/ 可溶性总氮 IN/STN (%) 可溶性有机氮/可溶性总氮 SON/STN (%) 无芒雀麦 Bromus inermis 2 8.53 18.83 27.36 72.64 10.62 34.97 45.59 54.41 3 9.22 14.06 23.28 76.72 7.76 10.95 18.71 81.29 4 21.31 29.70 51.01 48.99 16.16 32.65 48.80 51.20 老芒麦 Elymus sibiricus 2 4.11 25.46 29.58 70.42 4.02 30.94 34.96 65.04 3 8.41 11.57 19.98 80.02 7.88 14.37 22.25 77.75 4 17.34 34.52 51.85 48.15 18.68 33.57 52.25 47.75 垂穗披碱草 E. nutans 2 4.76 22.10 26.86 73.14 5.59 31.63 37.22 62.78 3 7.90 15.45 23.35 76.65 4.99 8.68 13.66 86.34 4 21.61 33.28 54.89 45.11 17.63 26.96 44.59 55.41 西北羊茅 Festuca ryloviana 2 3.41 21.63 25.03 74.97 3.69 34.93 38.61 61.39 3 7.30 12.14 19.44 80.56 4.80 10.28 15.08 84.92 4 22.18 30.79 52.98 47.02 19.56 25.19 44.75 55.25 中华羊茅 F. sinensis 2 5.91 28.37 34.28 65.72 4.87 33.10 37.97 62.03 3 5.99 16.15 22.14 77.86 5.49 11.04 16.53 83.47 4 20.13 34.85 54.98 45.02 15.41 30.43 45.85 54.15 青海扁茎早熟禾 Poa pratensis var. anceps ‘Qinghai’ 2 4.06 18.54 22.59 77.41 3.09 40.42 43.51 56.49 3 5.42 5.81 11.24 88.76 8.43 12.23 20.66 79.34 4 20.12 29.03 49.16 50.84 17.48 30.74 48.23 51.77 星星草 Puccinellia tenuiflora 2 4.33 27.73 32.06 67.94 4.32 33.36 37.68 62.32 3 8.18 20.37 28.55 71.45 5.74 6.08 11.82 88.18 4 21.18 32.90 54.09 45.91 18.33 29.73 48.07 51.93 冷地早熟禾 Poa crymophila 2 5.07 29.05 34.12 65.88 4.19 40.99 45.18 54.82 3 7.70 8.96 16.65 83.35 3.29 14.35 17.65 82.35 4 18.46 30.38 48.84 51.16 18.36 29.47 47.83 52.17