两种珍稀木兰属植物群落土壤分析与比较

Analysis and Comparison on Two Kinds of Soil in Rare Magnolia Habitats

为积累景宁木兰和黄山木兰植物资料库,更好的保护这两种珍稀植物,本研究结合两种树种实际生长环境,按500、750、950、1 100 m 4个海拔,采集了白云山景宁木兰0~20 cm的表层土壤,分0~20、20~40 cm两个剖面,采集了武夷山海拔1 800 m处的黄山木兰群落土壤。上述两类生境条件下土壤的理化、生化指标分析结果表明:两类土壤p H在4.5~5.72间,均为弱酸性,两类土壤中有机质、碱解氮含量相对丰富,速效磷含量相对缺乏,其中景宁木兰土壤中有机质含量28.51~35.03 g/kg,碱解氮含量218.50~275.97 mg/kg,速效磷含量0.47~2.41 mg/kg,平均值分别为黄山木兰土壤中对应指标含量的1.29倍,1.46倍和2.54倍。土壤脲酶活性能够在一定程度上表征景宁木兰和黄山木兰生境土壤的有机质和碱解氮含量。

In order to accumulate basic habitat data of Magnolia sinostellata and Magnolia cylindrica,and protect two kinds of rare Magnolia plant,soil samples were collected. One soil sample in Baiyun Mountain was collected in the depth of 0 ~ 20 cm at different attitudes of 500,750,950 and 1 100 m in turn which represented the habitant of Magnolia sinostellata. The other soil sample in Wuyi Mountain was collected in the depth of 0 ~ 20 cm and 20 ~ 40 cm at the attitude of 1 800 m represented the habitant of Magnolia cylindrica. The two kinds of soil samples analysis results showed that the soil p H was from 4. 50 to 5. 72. The contents of organic matter and available nitrogen were abundant,but the contents of available phosphorus were on the contrary. The contents of organic matter,available nitrogen and available phosphorus in the soil of Magnolia sinostellata were 28. 51 ~ 35. 03 g/kg,218. 50 ~ 275. 97mg/kg,0. 47 ~ 2. 41 mg/kg. The average value of the physicochemical index is as much as 1. 29 times,1. 46 times and 2. 54 times of Magnolia cylindrica soil respectively. In addition,the soil urease activity can express the nutrient index in the test soil.