测土配方施肥对湿地松生长与养分含量及其土壤肥力的影响

选择4年生湿地松优良家系试验林,通过测土配方施肥,研究其对湿地松生长与叶片、枝条养分含量及其土壤肥力的影响。结果表明:施肥后第2年,土壤全P含量与湿地松树高及胸径生长呈现极显著正相关,其数学模型分别为:y=-5.944 4 x+1.318 9、y=-7.500 0 x+2.700 0;施肥后土壤中速效K含量与叶片中全K含量呈现极显著正相关,其数学模型为:y=0.010 8 x-0.163 3;速效K含量与湿地松树高及胸径生长,其数学模型分别为:y=-0.032 8 x+1.513 3、y=-0.047 4 x+3.002 9;土壤中全N增长与湿地松叶片全N含量增长均呈现显著正相关,其数学模型为:y=7.016 1 x+0.162 1。湿地松平均树高与胸径相较于未施肥的对照组增幅分别达11%与13%以上,其差异达到了极显著水平。

Influence on growth of slash pine,nutrient content and soil fertility by soil testing and formulated fertilization

A four-year-old slash pine experimental forest was selected,in order to study on the influence on soil properties,the growth of slash pine and nutrient content in leaves and branches through soil testing and formulated fertilization.The result showed that,two years after fertilization,there was an extremely significant correlation between the content change of total phosphorus in soil and height and DBH growth of slash pine,the content change of available kalium in soil and content change of total kalium in leaves,and the mathematical model were y=-5.944 4x＋1.3189,y=-7.500 0x＋2.700 0and y=0.010 8x-0.163 3,respectively.Also there was a significant correlation between the content change of available kalium in soil and height and DBH growth of slash pine,the content growth of total nitrogen in soil and that in slash pine leaves,and the mathematical model were y=-0.032 8x＋1.513 3,y=-0.047 4x＋3.002 9and y=7.016 1x＋0.162 1,respectively.Compared to unfertilized plants,the growth of average height and DBH of fertilized slash pine were increased by 11% and 13% respectively,and the variance analysis showed that the differences reached a significant level.