【摘要】 利用 5a生马尾松种源与磷肥互作试验林 ,研究不同种源对磷肥的遗传反应式样以及在低 (缺 )磷环境下的根际营养差异。结果发现 ,广东高州和广西岑溪两种源对磷肥的反应显著 ,属于对磷肥敏感型种源 ,广东信宜和福建武平两种源对磷肥反应不敏感 ,属于耐低磷型或对磷肥不敏感型种源 ,而江西崇义种源显著的磷肥效应仅在造林后头 2～ 3年显示。对于根际土的的化学性质 ,不同种源虽有较大差异 ,但根际土的有机质、全氮、水解氮和有效磷含量一般显著高于非根际土。不同种源根际对土壤中的磷都具有活化作用和富集作用 ,尤其是广东信宜和福建武平两种源对土壤磷的活化和富集作用最为强烈 ,这可初步解释这两个种源对磷肥不敏感、能适应低 (缺 )磷胁迫的遗传机制。马尾松不同种源根际土壤并未发生明显的酸化。更多还原

【Abstract】 A provenance-by-phosphorus-interaction trial of Pinus massoniana at age 5 was conducted to study genetic response of different provenances to phosphorus supply and their nutrient characteristics of rhizosphere soil under phosphorus stress.Significant phosphorus effect was found for both provenances of Cenxi GX and Gaozhou GD regarded as sensitive provenances to phosphorus supply,while Xinyi GD provenance and Wuping FJ provenance had higher tolerability to phosphorus stress or less sensitivity to phosphorus supply.For Chongyi JX provenance,the response to phosphorus was found to be marked only at age 2 or 3.There existed great differences in chemical characteristics of rhizosphere soil among 5 provenances. Percentages of organic matter,total N,hydrolytic N,and available P in rhizosphere soil were usually much higher than those in non-rhizosphere soil.Result indicated that P.massoniana roots of different provenances had an effect of soil phosphorus activation and available phosphorus enrichment,especially both provenances of Xinyi GD and Wuping FJ,which could preliminarily explain their genetic mechanism of adaptation to phosphorus stress.Marked acidification was not observed in their rhizosphere soil for provenances tested.更多还原