【摘要】 本文对湖南会同地区在杉木林采伐后天然更新起来的20年生的马尾松林进行了生物量的测定。乔木层生物量采用“相对生长测定法”(Allometricmethod);下木层和草本层采用“样方收获法”。结果表明,林分总生物量为103.93吨/公顷,平均净生产量为5.45吨/公顷·年,其中乔木层分别为100.02吨/公顷和5.16吨/公顷·年,远远高于同年龄的欧洲赤松人工林;与湖南会同地区速生的杉木林比较,亦相差无几。从生物量的积累和分配来看,下层木的产量结构是不合理的,应是抚育间伐的对象。更多还原

【Abstract】 A preliminary analysis of plant biomass and production of stem,bark,branches,foliages,and roots in 20 years old Pinus massoniana stand naturallyregenerated in Huitong county of Hunan province is presented.The followingregression equations were derived from the standing crop of the destructivetrees: log W_s=0.95861log（D²H）-1.77859 log W_Bk=0.95724log（D²H）-2.75449 log W_B=1.22251log（D²H）-3.29930 log W_F=1.30291log（D²H）-3.78252 log W_R=1.12908log（D²H）-2.86012 The total biomass and net production in middle stand were,103.93 ton/haand 5.45 ton/ha·yr respectively.These data show that the biological produc-tivity of Pinus massoniana stand is higher than that in Pinus sylvestris standof the same age.更多还原