摘要
采用石灰性土壤无机磷分级体系，选取黄土高原4种典型植被：柠条、马铃薯、苜蓿和枣树，与裸地作比较，对自然表层土壤中磷素状况进行分析。结果表明：研究区土壤全磷含量0．55～0．85g／kg，速效磷含量2．402～5．920mg／kg，均处于较低状态；无机磷含量占全磷的60．76％～90．85％，在各无机磷形态中，以Ca—P（79．37％）为主，几乎没有闭蓄态磷（O-P）；不同无机磷形态的比例顺序是：O—P〈Ca2-P〈Al-P〈Fe—P〈Cas—P〈Ca10-P，其中柠条林地的Ca2-P和Ca8-P无机磷最高，其次是枣树，马铃薯和苜蓿几乎相等。相关分析表明，Ca2-P和Ca8-P与速效磷均呈显著的正相关关系，因此，Ca2-P和Cas—P是土壤速效磷的主要来源。
By inorganic phosphorus fractionation method for calcareous soils, study was made on the forms and compositions of inorganic phosphorus in 0--20 cm layer of calcareous soil on sloping land with different vegetation in the Loess Plateau. The typical vegetation included bare land, Caragana korshinskii, Solanum tuberosurn , Medicago sativa L. and Ziziphusjujuba. The results showed that the content of total P in the soil with five kinds of vegetation was high, from 0.55 to 0.85 g/kg, but the content of available P was low except Caragana korshinskii （5. 920 mg/kg） and Medicago sativa L. （5. 332 mg/kg）. It was also found that inorganic phosphorus was the main proportion of TP. Among the inorganic phosphorus fractionation, the order of the proportion was Ca2 -P〈Al- P〈Fe- P〈 Ca8 -P〈 Ca10- P, and the order of the contents of Ca2 -P and Ca8 - P of the soil was Caragana korshinskii 〉 Ziziphus jujuba 〉 Medicago sativa L. ≈ Solanum tuberosum. And O- P was not found. We also found that both Ca2 - P and Ca8 - P had a positive correlation with available P, and Ca2 - P had a positive correlation with Ca8 - P.
出处
《干旱地区农业研究》
CSCD
北大核心
2008年第1期29-32,共4页
Agricultural Research in the Arid Areas
基金
黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-138)
"973"项目(2005CB121102)
西北农林科技大学创新团队计划项目资助
关键词
无机磷形态
分布
典型植被
黄土高原
inorganic phosphorus fractionation
distribution
typical vegetation
loess plateau
