沿海沙地竹林细根养分含量及其季节动态

对福建省漳州市东山赤山国有防护林场沿海沙地竹林细根的养分含量(N、P、K)进行研究。结果表明:沿海沙地各竹林细根养分含量总体偏低,早竹细根N年均含量最高为10.964g.kg-1,雷竹最低为4.535 g.kg-1,台湾桂竹细根P年均含量最高为0.971 g.kg-1,乌哺鸡竹最低为0.136 g.kg-1,四季竹细根K年均含量最高为2.761 g.kg-1,花吊丝竹最低为1.127g.kg-1。各竹种细根N、P、K养分含量都有规律性的季节变化,均表现出单峰或双峰的变化趋势,竹林生长旺季波动较大,生长后期趋于稳定,各竹种之间N年均含量变化的规律性最强,P次之,K最弱。丛生竹细根N(早竹除外)、P年均含量均高于散生竹,而K年均含量丛生竹与散生竹间差别不大。

Study on the nutrient content (N, P, K) and seasonal dynamic state of fine bamboo roots in coastal sandy sites

Research on the nutrition content(nitrogen,phosphorus,potassium) of fine bamboo roots in coastal sandy sites in Chishan state-owned protective forest farm in Dongshan,Zhangzhou City,Fujian Province was conducted.The results showed that as a whole,the nutrition content of different fine roots in the coastal sandy sites was comparatively low.The highest annual average nitrogen content of fine root was Oligostachyum lubricum with 10.964 g·kg-1 while the lowest was Phyllostachys praecox with 4.535 g·kg-1;the highest annual average phosphorus content of fine root was Phyllostachys makinoi with 0.971 g·kg-1and the lowest was Phyllostachys vivax with 0.136 g·kg-1;the highest annual average potassium content of fine root was O.lubricum with 2.761 g·kg-1,the lowest was Dendrocalamus minor with 1.127 g·kg-1.The nitrogen,phosphorus and potassium nutrition content of different fine roots had a regular seasonal change.All of them showed one-humped or two-humped tendency,great fluctuation in the bamboo growth in rush season and stability in late stage.The nitrogen content change was the most regular,with the phosphorus content change being the second and the potassium content change the last.The annual average nitrogen(except P.praecox) and phosphorus content of cluster bamboo was higher than that of scattered bamboo,however,the annual average potassium content of cluster bamboo and scattered bamboo showed no significant difference.