影响小篷竹生长的主要地形和土壤因子研究

Main Topographic Factors and Soil Factors Influencing the Growth of Drepanostachyum luodianense

在野外样地调查的基础上,利用均值t检验的方法,研究了影响小篷竹生长的地形和土壤因子,结果表明:①在地形因子当中,影响小篷竹生长的主要因子为坡向和海拔,阳坡和较低海拔更利于小篷竹的生长,海拔900m为小篷竹生长良好与否的分界线.此外,坡下部生境、坡度30°以下较利于其生长,但影响不显著.②在土壤因子当中,影响小篷竹生长的主要因子为土壤厚度、有机质、有效磷和速效钾,土层厚度大于15cm、有机质质量分数100g/kg、有效磷质量分数2～3mg/kg、速效钾质量分数125mg/kg以上最适宜其生长,尤其对土壤有效磷和有机质质量分数要求苛刻.此外,中性土壤和较高的碱解氮质量分数较适宜其生长,然而影响不明显.

Based on a comprehensive field investigation of sampling plots,the topographic factors and soil factors influencing Drepanostachyum luodianense growth were studied,using the mean t-test method.Of the topographical factors studied,slope and altitude were shown to be the dominant influencing factors.Sunny slope and lower altitude were beneficial to D.luodianense growth,with 900 m as the demarcation line.In addition,a habitat of lower slope and a slope gradient less than 30 degrees benefited its growth,but the effect was non-significant statistically.Of the edaphic factors studied,soil depth,soil organic matter,available phosphorus and available potassium appeared to be the dominant influencing factors.Thick soil（5 cm）,adequate soil organic matter（100 g/kg）,available phosphorus（2~3 mg/kg） and available potassium（above 125 mg/kg） were optimal for the growth of D.luodianense.This plant species was quite particular about the contents of soil available phosphorus and organic matter.Besides,neutral soil and relatively high content of soil available nitrogen were beneficial for its growth,though the effect was non-significant statistically.