| 沿海沙地厚荚相思人工林养分生物循环特征 |
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| 引用本文： | 林宇. 沿海沙地厚荚相思人工林养分生物循环特征[J]. 西南林业大学学报, 2016, 36(6): 8-14.doi:10.11929/j.issn.2095-1914.2016.06.002 |
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| 作者姓名： | 林宇 |
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| 作者单位： | 福建省长乐大鹤国有防护林场，福建 长乐 350212 |
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| 基金项目： | 福建省林木种苗科技攻关项目 （闽林科 [2009] 4号） 资助；福建省林业科研项目 （闽林科 [2012] 3号） 资助。
摘要:用标准木法和收获法对闽东南沿海沙地8年生厚荚相思人工林N、P、K、Ca和Mg的养分含量、积累、分配和生物循环进行研究。结果表明：5种营养元素含量以树叶为最高，干材最低，各器官营养元素含量排序为N ＞ K ＞ Ca ＞ Mg ＞ P；营养元素总积累量为57921kg/hm2，各器官营养元素积累量排序为枝 ＞ 干 ＞ 皮 ＞ 叶 ＞ 根；各营养元素积累量排序为N ＞ K ＞ Ca ＞ Mg ＞ P。0~60cm土层土壤中5种养分元素含量大小排序为Ca ＞ K ＞ Mg ＞ P ＞ N，厚荚相思各器官对土壤养分的富集能力排序为叶 ＞ 根 ＞ 枝 ＞ 皮 ＞ 干。厚荚相思乔木层养分年存留量为7240kg/(hm2·a)，年吸收量为25525kg/(hm2·a)，总归还量为18285kg/(hm2·a)。5种元素利用系数和周转期均为K ＞ Ca ＞ P ＞ N ＞ Mg，循环速率为Mg ＞ N ＞ P ＞ Ca ＞ K，循环系数为072，利用系数为028，周转期为317a。厚荚相思林5种营养元素利用效率高，循环速率快，而周转期短，有利于沙质土壤肥力的恢复和生产力的维持。 |
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| 摘 要： | 用标准木法和收获法对闽东南沿海沙地8年生厚荚相思人工林N、P、K、Ca和Mg的养分含量、积累、分配和生物循环进行研究。结果表明：5种营养元素含量以树叶为最高，干材最低，各器官营养元素含量排序为N ＞ K ＞ Ca ＞ Mg ＞ P；营养元素总积累量为57921kg/hm2，各器官营养元素积累量排序为枝 ＞ 干 ＞ 皮 ＞ 叶 ＞ 根；各营养元素积累量排序为N ＞ K ＞ Ca ＞ Mg ＞ P。0~60cm土层土壤中5种养分元素含量大小排序为Ca ＞ K ＞ Mg ＞ P ＞ N，厚荚相思各器官对土壤养分的富集能力排序为叶 ＞ 根 ＞ 枝 ＞ 皮 ＞ 干。厚荚相思乔木层养分年存留量为7240kg/(hm2·a)，年吸收量为25525kg/(hm2·a)，总归还量为18285kg/(hm2·a)。5种元素利用系数和周转期均为K ＞ Ca ＞ P ＞ N ＞ Mg，循环速率为Mg ＞ N ＞ P ＞ Ca ＞ K，循环系数为072，利用系数为028，周转期为317a。厚荚相思林5种营养元素利用效率高，循环速率快，而周转期短，有利于沙质土壤肥力的恢复和生产力的维持。
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| 关 键 词： | 厚荚相思 养分积累 养分分配 养分循环 防护林 |
| 收稿时间： | 2016-04-11 |
Biological Cycling of Nutrients of Acacia crassicarpa Plantation in Coastal Sandy Area |
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| Lin Yu, Biological Cycling of Nutrients of Acacia crassicarpa Plantation in Coastal Sandy Area[J]. Journal of Southwest Forestry University, 2016, 36(6): 8-14.doi:10.11929/j.issn.2095-1914.2016.06.002 |
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| Authors: | Lin Yu |
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| Affiliation: | Dahe State owned Protection Forest Farm, Changle Fujian 350212, China |
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| Abstract: | Standard timber and harvesting methods were used to study the concentration, accumulation, distribution and biological cycling of the nutrient elements (N, P, K, Ca and Mg) in an 8 year old Acacia crassicarpa plantation on a sandy coastal plain soil in southeast Fujian Province, China. The results showed that nutrient contents in the leaves were the highest among those in different organs, with the lowest in the stems. The total nutrient accumulation was 57921kg/hm2. In this plantation, concentration of N was the highest among the five elements, followed by K, Ca, Mg and P. The nutrient accumulation of various organs was ranked as branches ＞ stems ＞ barks ＞ leaves ＞ roots in the pure plantation of Acrassicarpa, and the nutrient accumulation of the five elements were ranked as N ＞ K ＞ Ca ＞ Mg ＞ P. Nutrient contents of 0-60cm depth of soil was rank as Ca ＞ K ＞ Mg ＞ P ＞ N, the accumulation coefficients of nutrient elements of different organs was leaves ＞ roots ＞ barks ＞ branches ＞ stems. Annual net nutrient accumulation, return and absorption were 7240kg/(hm2·a), 18285kg/(hm2·a), and 25525kg/(hm2·a), respectively. The utilization coefficient and the recycling period of five nutrient elements were ranked as K ＞ Ca ＞ P ＞ N ＞ Mg, the cycling coefficient were ranked as Mg ＞ N ＞ P ＞ Ca ＞ K in this plantation. The nutrient cycling coefficient, the utilization coefficient and the recycling period were 072, 028, and 317a, respectively. The cycling coefficient was high, but recycling period was shot, which was conducive to the recovery of sandy soil fertility and productivity maintenance in the Acrassicarpa plantation. |
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| Keywords: | Acacia crassicarpa nutrient accumulation nutrient distribution nutrient cycling shelterbelt |
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