极小种群广西青梅群落凋落物及土壤理化特征

The Physiochemical Characteristics of Soil and Litter in Extremely Small Population of Vatica guangxiensis Community

对广西青梅(Vatica guangxiensis)圈地保护小区内凋落物特征及土壤理化性状进行了取样分析,并与全国第二次土壤普查养分分级表比较,结果表明:广西青梅保护小区内凋落物、有机碳、全氮、全磷、全钾平均存储量及最大持水率分别为1.603 t/hm^2、702.115 kg/hm^2、23.56 kg/hm^2、1 100.96 g/hm^2、2 323.09 g/hm^2、213.01%。土壤容重、土壤含水率、毛管持水量、毛管孔隙度、总孔隙度、非毛管孔隙度均值分别为1.15g/cm3、0.30%、436.18%、43.62%、56.75%、13.13%,土壤较为疏松透气。土壤碱解氮、有效铁含量分别为153.00、79.82 mg/kg,等级为1级;有机质、全氮、全磷、有效锌含量均值分别为32.75 g/kg、1.74 g/kg、0.89 g/kg、1.16 mg/kg,等级为2级;全钾含量均值为16.26 g/kg,等级为3级;有效锰含量均值为3.77mg/kg,等级为4级;速效钾、代换性钙、代换性镁、有效铜、有效硼含量较为缺乏,等级为5级;有效磷含量极度缺乏,等级为6级。

The characteristics of litter and physical and chemical properties of soil in the small protected area of Vatica guangxiensis were analyzed, compared with the Second National Soil Survey Nutrient （INES） , the results showed that the average storage of litter, organic carbon, total N, total P, total K and maximum water holding rate of the litter were 1. 603 t/hm2, 702. 115 kg/hm2, 23.56 kg/hm2, 1 100.96 g/hm2, 2 323.09 g/hm2, 213.01%, respectively. Soil bulk density, soil moisture content, capillary water holding capacity, capillary porosity, total porosity and non -capillary porosity were 1.15 g./cm3, 0. 30% , 436. 18% , 43.62% , 56.75% , 13.13% , respectively. The soil was relatively loose and venting. The average content of alkaline hydrolysis nitrogen and available iron of soil at one level was 153.00 mg/kg and 79. 82 mg/kg. The average content of organic matter, total N , total P and available Zn at two level was 32.75 g/kg, 1.74 g/kg, 0. 89 g/kg , 1.16 mg/kg, respectively. The average content of total K at three level was 16.26 g/kg. The average content of available Mn at the four level was 3.77 mg/kg. It is relatively lack of the average content of available K, exchangeable calcium, exchangeable Mg, available Cu, available B at five level. And it is extremely lack of the average content of available P at six level.