Soil nutrient properties in the distribution area of the extremely small population of Oncodostigma hainanense
Oncodostigma hainanense,a wild plant species with extremely small population,is concentrated in San-ya and Baoting,Hainan Province.We compared the differences of soil nutrient contents in different habitats of O.hainanense in Ganshiling Provincial Nature Reserve,Yalong Bay Tropical Paradise Forest Park,and Qixianling Hot Springs National Forest Park in Baoting Li and Miao Autonomous County,and examined the effects of soil pro-perties on the distribution characteristics of O.hainanense.The results showed that the structure of the three O.haina-nense populations was unstable,indicating a declining trend,with the highest population density in Qixianling For-est Park(375 individuals per hectare).Soil in the distribution areas was characterized by acidity,with pH values ranging from 5.54 to 6.17.Organic matter content,available nitrogen content,and total nitrogen content were rela-tively high in the soils,while total potassium,total phosphorus,and available phosphorus contents were relatively low.Soil microbial biomass carbon ranged from 225.28 to 318.33 mg·kg-1,and soil microbial biomass nitrogen ranged from 137.34 to 165.25 mg·kg-1.Ganshiling Nature Reserve exhibited the highest soil catalase activity(4.53 mL·g-1·h-1),while Yalong Bay Forest Park had the highest soil acid phosphatase and urease activities(9.78 mg·g-1·d-1 and 0.84 mg·g-1·d-1,respectively).PCA analysis results showed that soil samples from each site could be well clustered into one group,and the response of each distribution site to soil factors was signifi-cant.Soil nutrients were significantly correlated with microbial biomass and enzyme activities,indicating that soil factors played a key role in driving population structure and growth of O.hainanense.
Oncodostigma hainanensesoil nutrientsoil microbial biomasssoil enzyme activityextremely small population
万方数据
维普
