Cao Jian Jun, Wang Xue Yan, Li Meng Tian, Yang Shu Rong, Xu Xue Yun, Gong Yi Fan
College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China.
Ying Yong Sheng Tai Xue Bao. 2018 Jun;29(6):1839-1845. doi: 10.13287/j.1001-9332.201806.002.
After grasslands were contracted to individual households on the Qinghai-Tibetan Pla-teau, two grassland management patterns were formed, i.e., the single-household management pattern (SMP) and the multi-household management pattern (MMP). The soil nutrients and their spatial distributions under those two patterns were compared in the Nagchu Prefecture of Tibet. The results showed that the soil organic carbon, total nitrogen, and total phosphorus under the MMP (84.31, 6.87 and 0.59 g·kg) were all significantly higher than those under the SMP (73.57, 6.07 and 0.54 g·kg). On the vertical dimension, the variation coefficient of soil total phosphorous between 0-15 cm layer and 15-30 cm layer under SMP had no significant difference, while that of soil pH, soil organic carbon and total nitrogen in 15-30 cm layer were all higher than 0-15 cm layer under both patterns. On the horizontal dimension, the variation coefficients of soil organic carbon and total nitrogen under SMP were significantly higher than those under MMP, with the estimated values for the former being 25.7% and 23.5%, and for the latter being 19.3% and 18.6%, respectively. Compared with the MMP, the uneven distribution of nutrients could easily lead to soil nutrient loss under the SMP.
青藏高原草原实行家庭承包经营后，形成了单户经营模式（SMP）和多户经营模式（MMP）两种草原经营模式。对西藏那曲地区这两种模式下的土壤养分及其空间分布进行了比较。结果表明，多户经营模式下的土壤有机碳、全氮和全磷（84.31、6.87和0.59克·千克）均显著高于单户经营模式（73.57、6.07和0.54克·千克）。在垂直维度上，单户经营模式下0-15厘米土层与15-30厘米土层土壤全磷变异系数差异不显著，而两种模式下15-30厘米土层土壤pH值、土壤有机碳和全氮变异系数均高于0-15厘米土层。在水平维度上，单户经营模式下土壤有机碳和全氮变异系数显著高于多户经营模式，前者估计值分别为25.7%和23.5%，后者分别为19.3%和18.6%。与多户经营模式相比，单户经营模式下养分分布不均易导致土壤养分流失。
