2021年4月23日 星期五
不同林分红皮云杉针叶养分含量及生态化学计量特征研究
Study on nutrient contents and ecological stoichiometric characteristics in needles of Picea koraiensis in different stands
2020年 第29卷 第3期 页码[19-25]
摘要

 为了探明红皮云杉(Picea koraiensis Nakai)的限制性营养元素和合理施肥措施,对胡桃楸(Juglans mandshurica Maxim.)-红皮云杉混交林、水曲柳(Fraxinus mandshurica Rupr.)-红皮云杉混交林、黄檗(Phellodendron amurense Rupr.)-红皮云杉混交林和红皮云杉纯林中红皮云杉的针叶C、N和P含量以及C∶N、C∶P和N∶P的变化进行了比较,并对其变异和相关性进行了分析。结果表明:4种林分中红皮云杉的针叶C含量呈“升高—降低”的趋势,且在5月份最低、在8月份最高;4种林分中红皮云杉的针叶N和P含量大多呈“降低—升高—降低”的趋势,且在5月份最高、在9月份最低。胡桃楸-红皮云杉混交林和黄檗-红皮云杉混交林中红皮云杉的针叶C∶N、C∶P和N∶P持续升高,而其余2种林分中这3个指标呈“升高—降低—升高”的趋势,且4种林分中这3个指标在5月份最低、在9月份最高。比较而言,4种林分中红皮云杉的针叶C含量变异系数最小(5.02%~6.17%),而C∶P变异系数最大(16.59%~23.46%)。3种混交林中红皮云杉的针叶N∶P在5月份至6月份小于14,在7月份至8月份介于14~16,在9月份大于16;而红皮云杉纯林中红皮云杉的针叶N∶P则在5月份至8月份介于14~16,在9月份大于16。相关性分析结果表明:4种林分中红皮云杉的针叶C含量与N和P含量呈显著或极显著负相关;N含量与P含量呈极显著正相关;C∶N和C∶P与N和P含量呈负相关,且多数相关性显著。研究结果显示:总体来看,4种林分中红皮云杉生长在5月份至6月份受N限制,在7月份至8月份受N和P共同限制,在9月份受P限制,因此,建议在5月份至6月份施加氮肥,在7月份至8月份同时施加氮肥和磷肥。

Abstract

In order to explore restrictive nutrition elements and reasonable fertilization measures of Picea koraiensis Nakai, changes in C, N and P contents and C∶N, C∶P and N∶P in needles of P. koraiensis in Juglans mandshurica Maxim.-P. koraiensis mixed forest, Fraxinus mandshurica Rupr.-P. koraiensis mixed forest, Phellodendron amurense Rupr.-P. koraiensis mixed forest and P. koraiensis pure forest were compared, and their variations and correlations were analyzed. The results show that C content in needles of P. koraiensis in four stands shows a trend of “increasing-decreasing”, and reaches the lowest in May and the highest in August. N and P contents in needles of P. koraiensis in four stands mostly show a trend of “decreasing-increasing-decreasing”, and reach the highest in May and the lowest in September. C∶N, C∶P, and N∶P in needles of P. koraiensis in J. mandshurica-P. koraiensis mixed forest and P. amurense-P. koraiensis mixed forest increase gradually, while these three indexes in other two stands show a trend of “increasing-decreasing-increasing”, and these three indexes in four stands reach the lowest in May and the highest in September. In comparison, the coefficient of variation of C content in needles of P. koraiensis in four stands is the smallest (5.02%-6.17%), while that of C∶P is the largest (16.59%-23.46%). N∶P in needles of P. koraiensis in three mixed forests is less than 14 from May to June, between 14-16 from July to August, and greater than 16 in September; while that in needles of P. koraiensis in P. koraiensis pure forest is between 14-16 from May to August, and greater than 16 in September. The correlation analysis result shows that C content in needles of P. koraiensis in four stands shows a significant or extremely significant negative correlation with N and P contents; N content shows an extremely significant positive correlation with P content; C∶N and C∶P show negative correlations with N and P contents, and most correlations are significant. It is suggested that overall, the growth of P. koraiensis in four stands is limited by N from May to June, commonly limited by N and P from July to August, and limited by P in September. Therefore, it is recommended to apply nitrogen fertilizer from May to June and simultaneously apply nitrogen and phosphate fertilizers from July to August.

关键词红皮云杉; 林分; 养分含量; 生态化学计量特征; 变异系数; 相关性分析
Key wordsPicea koraiensis Nakai; stand; nutrient content; ecological stoichiometric characteristics; coefficient of variation; correlation analysis
作者周磊, 吴慧, 王树力
所在单位东北林业大学林学院, 黑龙江 哈尔滨 150040
点击量557
基金项目国家科学技术部“十三五”重点研发计划项目(2017YFD0601103); 黑龙江省省级财政林业科研专项(201522)