随县澧潭镇油茶园土壤养分现状及评价

Evaluation of Soil Nutrient Status of Camellia Oleifera Orchard in Huantan Town of Sui County

摘要:

针对随县漫潭镇油茶种植中土壤养分不均、油茶产量不稳等问题,研究其土壤养分和土壤肥力状况,为油茶土壤 养分诊断及科学施肥提供依据 。采集随县典型油茶园 0～40cm土层样品,测定土壤 pH值、有机质、全氮、速效磷、速效钾、 有效硼及有效锰的含量,与全国第二次土壤普查分级标准进行比对评价,并对土壤 pH值和养分含量进行相关性分析 。结 果表明:①土壤 pH值总体上偏酸性 。②土壤有机质含量中等,全氮含量较缺乏,速效磷、速效钾、有效硼含量极缺乏,有效 锰含量非常充足 。③土壤pH值与土壤有机质、全氮、速效磷、速效钾、和有效锰含量均呈显著正相关关系 。综上所述,建议 适当增施磷、钾肥及硼肥,并密切关注土壤 pH值的动态变化。

Abstract:

Aiming at problems of unbalanced soilnutrients and unstable yie1d of Came11ia o1eifera in Sui County, the status of soilnutrients and soi1fertility were studied and evaluated to provide the basis for scientific fertilization and soilnu- trient diagnosis . 0～40cm soi1samples were collected to analyze soilpH and the contents of organic matter, totalnitro- gen ,availab1e phosphorus,available potassium,available boron and available manganese . Soilfertility was compared and e- valuated with soilnutrient classification standard of the second nationalsoilsurvey. Correlation analysis of pH soilnutrient content in C. O1eifera orchard was conducted. The results showed that:①SoilpH was s1ightly acidic . ②The soilor- ganic matter content reached the intermediate 1evel. The soiltotalnitrogen content was in the deficient level. The contents of available phosphorus,available potassium and available boron in soilwere extremely low . The soilavailab1e man- ganese content was abundant. ③SoilpH was significantly positively correlated with the content of organic matter, totalnitrogen,availab1e phosphorus , available potassium, and available manganese in soil. In conclusion, phosphorus, potassium and boron feitilizer should be added appropriately and the variation characteristic of soilpH should be given c1ose concern . In order to investigate the influence of continuous autumn rain on the PSⅡof Camellia oleifera,an OS30P+ modulated chlorophyll fluorometer was used to monitor the dynamic curves of rapid chlorophyll fluorescence induction of C.oleifera under continuous autumn rain.The results showed that the chlorophyll fluorescence parameters of C.oleifera's new leaves fluctuated May to August 2020,along with no significant variation between the chlorophyll fluorescence parameters of each month.The electron transfer efficiency from QA to Q(B )was lower in the early stage of new leaves than that in the later stage, suggesting that the electron transfer rate is inhibited in the early stage of new leaves.There was a moderate continuous rain in autumn from September 17 to 28,2020,with no significant change in the kinetic parameters of rapid chlorophyll fluorescence induction.The cloudy and rainy weather had no significantly adverse effects on the photosynthetic apparatus of C.oleifera.It can be considered that the moderate continuous rainy weather in autumn did not cause substantial negative effects on the photosynthetic organs of C.oleifera.