三峡库区纽荷尔脐橙园土壤营养状况及其对果实品质的影响

Main soil nutrient status and its effect on fruit quality of Newhall Orange in 3-gorge area

2002年测定了三峡库区4个纽荷尔脐橙园0～40cm土层的土壤营养状况，分析了相应果园2003年纽荷尔脐橙果实的主要品质。结果表明，供试果园土壤养分状况差别较大，兴山县供试果园土壤养分状况最好，巴东县的次之，奉节县供试果园稍差于巴东县，秭归县的供试果园土壤养分含量不如其它产地；奉节县纽荷尔脐橙果实的主要营养品质最好，但果面着色情况则以秭归县最佳。多元线性逐步回归分析结果表明，在一定范围内，可滴定酸含量与土壤有效磷含量呈显著的线性负相关；固酸比与土壤有机质和有效磷含量呈极显著的线性正相关；维生素C含量与土壤速效钾含量呈线性正相关；果皮红色值与有机质含量呈极显著正相关，但与土壤速效钾含虽旱极显著直线负相关；果皮黄色值与土壤碱解氮含量呈显著直线正相关。

The soil nutrient status （0 - 40 cm） and their fruit quality were tested respectively in 2002 and 2003 from 4 Newhall Navel Orange orchards of 3 - gorge area. The results showed that the difference of main nutrient status and fruit quality among 4 orchards was significant. The soil nutrient status of XS - HB was the best, that of BD - HB was the second, then that of FJ - CQ, that of ZG - HB was the worst; The main fruit nutrient quality of FJ - CQ was the best, but the best peel color was that from ZG- HB. The multiple linear stepwise regression analysis revealed that among a certain range, the TA content was significantly correlated with soil avail. P （negatively）, the ratio of TSS to TA was most significantly correlated with SOM and avail. P （positively）, the Vc content was significantly correlated with avail. K （positively）, the peel redness was most significantly correlated with both SOM （positively） and avail. K （negatively）, and the peel yellowness significantly correlated with avail. N （positively）,