湿地松×加勒比松F_1杂种的扦插苗与实生苗早期生长比较

A Comparison on the Early Growth of Cutting Stock and Seedlings of Slash Pine × Caribbean Pine F_1 Hybrids

利用湿地松与加勒比松的7个杂交组合的扦插苗和实生苗营建对比试验林,扦插苗和实生苗的造林成活率分别为97 19%和97 55%;造林后第4年,杂种松无性群体和实生群体相对于湿地松种子园种的树高、胸径、材积现实增益分别达29%与26%、34%与34%、133%与135%;杂种的无性群体在种植后的1～3a内生长比实生群体慢,但年生长量逐年增大,到第4年时可超过实生群体。初步的试验结果表明,优良杂种的扦插苗可在我国南方地区推广应用。

The cutting stocks and seedlings of 7 full-sib families of slash pine (Pinus elliottii var. elliottii) × caribbean pine (P. caribaea var. hondurensis) F_1 hybrid were planted in a trial in Taishan (22°11′N,112°49′E). The test was measured at age 1 for survival and height; and at age 3, 4 for height, diameter at breast height (DBH). The average survival rates of cutting stocks and seedling were 97.19% and 97.55%, respectively. All hybrid families performed better than seed-lot of slash pine first-generation seed orchard in Taishan, at the age of 4. Relative realized gains of cutting stocks and seedlings of the slash pine seed-lot were 29% and 26%, 34% and 34%, 133% and 135%, for height, DBH and volume, respectively. The total growth of cutting stocks was slower than that of seedlings, in the first 3 years. But the increment of cutting stocks increased gradually, and it exceeded the seedlings at the age of 4. It was suggested that the cutting stocks or seedlings of superior hybrid families could be planted extensively in the southern region of China.