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对江汉平原新造杨树人工林进行了连续3a的施肥方式研究。试验共设不施肥,3月份一次四点穴施,6月份一次四点穴施,3、6月份各半四点穴施(深25cm),3、6、8月份各1/3四点穴施,3、6月份各半圈施,3、6月份各半四点穴施(深50cm)等7个处理。试验结束时调查各处理杨树株高、胸径,并计算材积量。结果表明:每年6月一次四点穴施对杨树树高、胸径和材积生长的促进作用最明显,其它方式效果一般,而3月份一次性施肥效果最差,且与不施肥间无明显差异。
The new-type poplar plantations in the Jianghan Plain were studied for three consecutive years. A total of four fertilizers were applied in the experiment. Four acupuncture points were applied in March, four acupoints applied in June, three acupoints applied in June and June (25cm deep), 1/3 acupoints applied in 3, 6 and August, June each half circle Shi, 3, June and a half acupuncture facilities (depth 50cm) and other seven treatment. At the end of the experiment, the plant height and DBH of poplars were investigated and the volume of wood was calculated. The results showed that the effect of four acupoints application on poplar tree height, DBH and volume growth was the most obvious in June each year. The other methods were generally effective. However, the effect of one-time fertilization was the worst in March and there was no significant difference between the two treatments.