泰宁雷公藤根系分布规律

对泰宁县3种雷公藤林分的雷公藤根系含水率和生物量进行研究。结果表明,3年生林分比5年生林分的根系含水率低;野生林分根系生物量远小于人工林林分,前者总根量仅达到430.019 kg.hm-2,而后两者则分别达到1073.070和1937.669 kg.hm-2;不同类型林分的根系生物量在各径级中分配的共同规律:粗根>中根>细根,根系生物量的垂直分布随着土壤深度的增加而逐渐下降,在0-10 cm的土层中,根生物量所占比例最大,达总量的40%以上,随后逐层减少;在30-40 cm的土层中,根量所占比例已经很小了,而>40 cm的土层,几乎没有根系,根量绝大部分集中在前3层(0-30 cm)。

Root distribution law of Tripterygium wilfordii in Taining

Moisture content and root biomass of 3 types of Tripterygium wilfordii stands in Taining were studied.The results showed that moisture content of stand at 3 ages was lower than stand at 5 ages;per hm2 of root biomass of wild forest was lower than man-made forest,the former was up to 430.019 kg,the latter two were up to 1 073.070 and 1 937.669 kg;the common law existed among different types of stands:coarse root>middle root>fine root;vertical distribution of root biomass descended rapidly along with increasing of soil depth,the content of root biomass was the largest from 0 to 10 cm,up to more than 40%,then descended,root biomass was very low from 30 to 40 cm,finally,it was almost nothing from 40 to 50 cm,so a majority of root biomass concentrated in frontal 3 layers (from 0 to 30 cm).