不同岩性土体上构树苗木的生长效应

Study on the growth effect of Broussonetia lpyrifera(L.) Vent. on various lithological soil bodies

选择1年生构树Broussonetia lpyrifera苗移植到6种不同岩性土体上培育1年（2年生苗）,分析苗木生长效应,结果表明,构树苗木在不同岩性土体上其高、地径生长都产生差异。在白云质石灰岩和石英砂岩土体上生长最好,年净生长量超过164 cm和17mm,其后依次为第四纪红色黏土、变余砂页岩、紫色砂页岩,在煤系砂页岩土体上生长最差,年净生长量仅为46 cm和6.39mm。构树苗木年生长动态呈“慢—快—慢”的趋势,移栽后160～199d生长速度最快。不同岩性土体构树苗木含水量不同,分别为43.63%～57.26%。白云质石灰岩生物量最大,为420g,其后依次是石英砂岩为371g、第四纪红色黏土为179g、紫色砂页岩为170g、变余砂页岩为160g、煤系砂页岩为80g。

The growth of Broussonetia lpyrifera（ L. ）Vent. Two-year-old seeding on six different soil types were studied, the results showed that the height and diameter of Broussonetia lpyrifera （ L. ） Vent. , lam are significantly difference among six soil types. The limy dolomite and the quartzy are the best, their average growth each year are 164cm and 17mm. The next are quaternary red clay sandston,the Ms sandston-the purple sandston, the coal sandston is the worst, its average growth each,year is only 46cm and 6.39mm. The yearly growth is dynamics in height and diameter for Brous-sonetia lpyrifera（ L. ） Vent. ,following the pattern＂ slow - fast - slow＂. The fast growth dynamics was 160 days to 199days after transplating. The water contents of zhese seedings are different among different soil types with the values of 43.63% and 57. 26%. The biomass of seedings on the limy domite is the best（420g）, followed by the quartzy（371g） ,the quaternary red clay sandston（ 179g）, the purple sandston（ 170g）, the Ms sandston 160g）, the coal sandston is the worst （80g）.