Abstract Uneven seasonal rainfall results in insufficient water supply and low yelds of Camellia oleifera growing in mountainous and hilly areas without irrigation conditions. To assess the effectiveness of mulching on the yield and quality of three cultivars of C. oleifera (‘Hengdongdatao’, ‘Huashuo’ and ‘Xianglin 210’) and its influence of preserving soil moisture, a field experiment was conducted in 2016 in Changning, Hunan. Mulching materials of ecological pad (T1), straw (T2), straw and ecological pad (T3), gravel (T4), sawdust (T5) and camellia shell (T6) were tested and compared with un-mulched (CK). The mulch material with the strongest cooling effect in high-temperature weather was T2. The possible reason is that the surface roughness of the mulching material is good for reflecting light. T3 was the most effective at maintaining soil moisture. The reason is that straw and ecological pad increased the thickness of the cover layer and their small pore size, thus the evaporation rate decreased. It can appropriately stable the temperature in high-temperature weather and can better maintain the soil moisture to provide adequate water for growth. T1showed soil moisture by 14.93%, 14.98%, 14.89% for three cultivars, respectively. All treatments increased yield compared to CK. T1 showed the highest yield and was higher than CK by 58%, 61% and 124% for Hengdongdatao, Huashuo, and Xianglin 210, respectively. Mulching with T1 (40.23% and 39.63%) resulted in the highest oil content ratio in ‘Hengdongdatao’ and ‘Huashuo’ and mulching with T4 (36.93%) resulted in highest oil content ratio in ‘Xianglin 210’. Treatment of the ‘Xianglin 210’cultivar with T1 was re-tested in 2017. In all months analyzed, related indicators measured were significantly different compared with CK. This research suggests that mulching organic material to C. oleifera hilly area is an effective measure to solve seasonal drought and increase yield when there are no irrigation conditions present.

中文翻译：

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不同有机覆盖处理对油茶产量和品质的响应

摘要 生长在缺乏灌溉条件的山区和丘陵地区的油茶，由于季节性降雨不均，供水不足，产量低。为评估覆盖对三个油茶品种（'恒东大稻'、'华硕'和'湘林210'）产量和品质的影响及其对土壤保墒的影响，于2016年在长宁进行了田间试验，湖南。对生态垫（T1）、稻草（T2）、稻草和生态垫（T3）、砾石（T4）、锯末（T5）和山茶壳（T6）的覆盖材料进行了测试，并与未覆盖（CK）进行了比较。高温天气降温效果最强的地膜材料为T2。可能的原因是覆盖材料的表面粗糙度有利于反射光线。T3 在保持土壤水分方面最有效。原因是秸秆和生态垫增加了覆盖层的厚度和较小的孔径，从而降低了蒸发率。在高温天气下能适当稳定温度，能更好地保持土壤水分，为生长提供充足的水分。T1显示三个品种的土壤水分分别为14.93%、14.98%、14.89%。与CK相比，所有处理都增加了产量。横东大涛、华硕和祥林210的T1产量最高，分别比CK高58%、61%和124%。T1覆盖（40.23%和39.63%）导致'横东大涛'和'华硕'含油率最高，T4覆盖（36.93%）导致'湘林210'含油率最高。2017年对'湘林210'品种进行了T1处理，在所有分析月份中，测定的相关指标与CK相比有显着差异。这项研究表明，在没有灌溉条件的情况下，在油菜花丘陵地区覆盖有机物质是解决季节性干旱和提高产量的有效措施。