不同保留密度对福建柏人工林生长的影响

Effects of Different Reserved Densities on the Growth of Fokienia hodginsii Plantation

在福建省安溪白濑国有林场对间伐(保留密度分别为425、725、825株·hm-2)后的27年生福建柏人工林的林分生长状况、林下植被生物多样性以及林下土壤的养分状况进行调查研究。结果表明:不同保留密度对福建柏林分生长影响显著,降低林分密度能促进福建柏个体粗生长,但林分密度过低单位面积产量下降。林分单位面积蓄积量,以密度725株·hm-2的林分最高,达211.42 m3·hm-2;密度425株·hm-2的林分最低,为134.02 m3·hm-2,二者蓄积量差异达77.4 m3·hm-2。间伐能有效提高林下植被的丰富度指数和多样性指数,间伐强度越大效果越明显,保留密度425、725、825株·hm-2林下灌木植被丰富度分别为17、10、7,生物多样性指数(Shannon-Wiener指数)分别为2.137、1.633、1.356。中度间伐(保留密度为725株·hm-2)的林分土壤的养分状况最好,对维持地力效果最佳。

In Anxi Bailai State-Owned Forest Farm,the growth status,undergrowth biodiversity and soil nutrient status （reserved density respectively 425,725,and 825 strains hm-2 ） of 27-year-old Fokienia hodginsii plantation stand after thinning were stud-ied.Results showed that the different retention density effect on Fokienia hodginsii plantation stand growth was significant,reducing the stand density could promote the growth of Fokienia hodginsii individual thickening growth,but the stand density was too low and the unit area yield declined.The forest stand volume was highest with the density of 725 plants hm-2 ,up to 211.42 m3 · hm-2;the forest stand volume was the lowest with the density of 425 trees hm-2 ,up to 134.02 m3 · hm-2 ,the two volume difference reached 77.4 m3 · hm-2.The thinning could effectively increased the undergrowth richness index and diversity index,the larger the thinning intensity was,the more obvious the effect was,the understory shrub vegetation abundance reached 17,10 and 7,respectively with the retains densities of 425,725,825 plants hm-2 The biodiversity indexes （shannon wiener indexes） were 2.137,1.633,1.356,respec-tively.The moderate-thinned （ reserved density of 725 plants hm-2 ） stand soil nutrient status was the best,the maintaining soil fertili-ty effect was the best.