“丹若1号”是一种适宜在海南种植的软籽石榴,但在生产上常受到日灼伤害。以“丹若1号”石榴果实为试验材料,测定自然生长(未套袋)、套袋和套袋—去袋处理的果实籽粒可溶性固形物含量、果皮色素含量、色差值、类黄酮含量、总酚含量、活...“丹若1号”是一种适宜在海南种植的软籽石榴,但在生产上常受到日灼伤害。以“丹若1号”石榴果实为试验材料,测定自然生长(未套袋)、套袋和套袋—去袋处理的果实籽粒可溶性固形物含量、果皮色素含量、色差值、类黄酮含量、总酚含量、活性氧损伤指标和抗氧化酶活性,综合评价套袋对“丹若1号”石榴果皮外观的影响。结果显示,3个处理采收期果实籽粒色泽无明显差别,可溶性固形物含量无显著差异,表明套袋未影响果实的主要内在品质。叶绿素和类胡萝卜素含量较低,对果实发育后期着色影响不大;而花青苷含量是影响“丹若1号”石榴果皮着色的关键因素,以套袋—去袋处理含量显著最高,为11.12(OD 530-OD 600)/g FW,且果皮光滑靓丽,颜色更红。3个处理中,以套袋处理的果皮类黄酮和总酚含量显著最低,分别为30.71 OD 325/g FW和157.74 OD 280/g FW。结合过氧化氢含量、羟自由基清除能力和丙二醛含量分析,发现套袋处理果皮受到的活性氧损伤程度最低;自然生长(未套袋)和套袋—去袋处理分别通过提升过氧化氢酶和过氧化物酶活性来应对组织活性氧损伤,但套袋—去袋处理未造成影响表型的活性氧损伤。因此,套袋—去袋处理可作为一种潜在的改善“丹若1号”软籽石榴外观品质的优良技术手段推广。展开更多
In the tropical regions represented by Hainan,there are abundant solar and thermal resources,and it is relatively suitable for the construction of photovoltaic greenhouse(PVG).However,the construction of PVG still rel...In the tropical regions represented by Hainan,there are abundant solar and thermal resources,and it is relatively suitable for the construction of photovoltaic greenhouse(PVG).However,the construction of PVG still relies mainly on experience and is incapable of quantifying the balance between the photovoltaic(PV)generation and the light requirements for agricultural production.As a result,actual PVGs are primarily PV-based,without carefully considering the needs of agricultural daylighting.To quantify the influence of the design parameters of PVGs and the layout of PV panels on the internal daylighting of serrated PVGs,and to optimize the daylighting design of the roof,this paper utilizes the Design Builder software to establish gradient models for a multi-span serrated-type PVG in tropical regions.Gradient models were established in terms of aspects,namely span,width of longitudinal/transverse daylighting strip,height,roof angle,and photovoltaic panel coverage rate(PCR).Daylighting in the greenhouse of each gradient model was simulated,and with the annual average daily light integral(A_(DLI))and distribution uniformity(DU)as evaluation indicators,the influence of various design parameters on the daylighting inside the greenhouse was quantified.The result reveals that:(1)PCR is the decisive indicator for daylighting in the PVG,and a function between PCR and the A_(DLI) is derived as A_(DLI)=-15.5 PCR+16.841;(2)Increasing the width of longitudinal daylighting strip significantly improves the A_(DLI) and enhances DU while increasing the span has a noticeable effect on improving A_(DLI) but does not significantly enhance DU;(3)Increasing the eave height without changing PCR does not enhance A_(DLI) but effectively improves DU;increasing the transverse daylighting strip and adjusting the roof angle hardly improves A_(DLI).In summary,it is recommended that the optimal span for PVGs in tropical regions be set within the range of 6.5-8.0m,and the eave height be set within the range of 2.5-3.5m.Preferably,the longitudinal daylighting strip with a width ranging from 0.5-0.8m should be installed.Based on the above relationship function,the PCR can be calculated according to the appropriate light demand for the cultivated crops.The daylighting design theory proposed in this paper can provide a theoretical basis and reference for the healthy development of the PV industry in tropical regions.展开更多
文摘“丹若1号”是一种适宜在海南种植的软籽石榴,但在生产上常受到日灼伤害。以“丹若1号”石榴果实为试验材料,测定自然生长(未套袋)、套袋和套袋—去袋处理的果实籽粒可溶性固形物含量、果皮色素含量、色差值、类黄酮含量、总酚含量、活性氧损伤指标和抗氧化酶活性,综合评价套袋对“丹若1号”石榴果皮外观的影响。结果显示,3个处理采收期果实籽粒色泽无明显差别,可溶性固形物含量无显著差异,表明套袋未影响果实的主要内在品质。叶绿素和类胡萝卜素含量较低,对果实发育后期着色影响不大;而花青苷含量是影响“丹若1号”石榴果皮着色的关键因素,以套袋—去袋处理含量显著最高,为11.12(OD 530-OD 600)/g FW,且果皮光滑靓丽,颜色更红。3个处理中,以套袋处理的果皮类黄酮和总酚含量显著最低,分别为30.71 OD 325/g FW和157.74 OD 280/g FW。结合过氧化氢含量、羟自由基清除能力和丙二醛含量分析,发现套袋处理果皮受到的活性氧损伤程度最低;自然生长(未套袋)和套袋—去袋处理分别通过提升过氧化氢酶和过氧化物酶活性来应对组织活性氧损伤,但套袋—去袋处理未造成影响表型的活性氧损伤。因此,套袋—去袋处理可作为一种潜在的改善“丹若1号”软籽石榴外观品质的优良技术手段推广。
基金2024 Science and Technology Commissioner Service Group's Emergency Science and Technology Research Project for Wind Disaster Relief in Hainan Province(ZDYF2024YJGG002-8)China Huaneng Group Co.,Ltd.Headquarters Technology Project,Optimization of Photovoltaic Vegetable Greenhouse Structure and Research on Planting Agronomy in Tropical Regions(HNKJ22-HF77)。
文摘In the tropical regions represented by Hainan,there are abundant solar and thermal resources,and it is relatively suitable for the construction of photovoltaic greenhouse(PVG).However,the construction of PVG still relies mainly on experience and is incapable of quantifying the balance between the photovoltaic(PV)generation and the light requirements for agricultural production.As a result,actual PVGs are primarily PV-based,without carefully considering the needs of agricultural daylighting.To quantify the influence of the design parameters of PVGs and the layout of PV panels on the internal daylighting of serrated PVGs,and to optimize the daylighting design of the roof,this paper utilizes the Design Builder software to establish gradient models for a multi-span serrated-type PVG in tropical regions.Gradient models were established in terms of aspects,namely span,width of longitudinal/transverse daylighting strip,height,roof angle,and photovoltaic panel coverage rate(PCR).Daylighting in the greenhouse of each gradient model was simulated,and with the annual average daily light integral(A_(DLI))and distribution uniformity(DU)as evaluation indicators,the influence of various design parameters on the daylighting inside the greenhouse was quantified.The result reveals that:(1)PCR is the decisive indicator for daylighting in the PVG,and a function between PCR and the A_(DLI) is derived as A_(DLI)=-15.5 PCR+16.841;(2)Increasing the width of longitudinal daylighting strip significantly improves the A_(DLI) and enhances DU while increasing the span has a noticeable effect on improving A_(DLI) but does not significantly enhance DU;(3)Increasing the eave height without changing PCR does not enhance A_(DLI) but effectively improves DU;increasing the transverse daylighting strip and adjusting the roof angle hardly improves A_(DLI).In summary,it is recommended that the optimal span for PVGs in tropical regions be set within the range of 6.5-8.0m,and the eave height be set within the range of 2.5-3.5m.Preferably,the longitudinal daylighting strip with a width ranging from 0.5-0.8m should be installed.Based on the above relationship function,the PCR can be calculated according to the appropriate light demand for the cultivated crops.The daylighting design theory proposed in this paper can provide a theoretical basis and reference for the healthy development of the PV industry in tropical regions.
