| With continuous increase of the coastal population,tourism industry and its related industries have developed rapidly,and coastal resources have been used excessively,causing serious damage to sandy coastal areas.The ecological succession of coastal vegetation has been hindered in Guangxi region.Reduced biodiversity of local desert plants and vegetation coverage.In this paper,the lianas thickets in coastal sands in Guangxi are taken as the research object,and selected through the selection of thick vines grown in sandy soil and native soil environments in the eastern coast of Guangxi(Beihai City)and the western coastal zone(Fangchenggang City).Growth,morphological structure,physiological and biochemical characteristics,chlorophyll fluorescence,and nutrient content were measured and analyzed for seasonal dynamics,and comprehensive evaluations were conducted to determine growth pattern and adaptability of Gossypium hirsutum in the coastal sandy environment.The restoration of vegetation and landscape construction provide a reference.The main results are as follows:1,Ipomoea pes-caprae leaves belong to full-gating leaves,and palisade tissue is distributed on the adaxial and distal surfaces of leaves.The stomatal density of Ipomoea pes-caprae is generally higher than native conditions,with an average increase of 35.53%;and the root conditions of Ipomoea pes-caprae are thickness of the lower epidermis is higher than native conditions,increased by average of 23.81%;Ipomoea pes-caprae is gradually adapting to growth of the sand conditions in terms,include its structural and functional characteristics.2,The contents of superoxide dismutase(SOD),peroxidase(POD)and active malondialdehyde(MDA)in leaves of vines showed a decreasing trend as the seasons changed.The increase in the soil environment is higher than that in the desert soil,increased by average of 38.10%.ABA content in the root system was significantly affected by the soil type.POD content under the native conditions was significantly higher than that under the desertification condition,increased by average of 18.57%.The root system of the thick vine showed a slowly decreasing trend during the period of November.3,The photochemical quenching coefficient(qN,NPQ)and non-cyclic photosynthetic electron transport rate(ETR)of Agrocybe aegerita were less than under native conditions under sandy conditions,and the chlorophyll fluorescence value of Ipomoea pes-caprae can be maintained at a normal value under the native conditions.0.7 or more,and the change is not significant.Thick vines respond to extreme coastal conditions by reducing chlorophyll fluorescence indicators under sand conditions.4,The content of nitrogen in the leaf of Ipomoea pes-caprae was found to be greater than that of the sand,ncreased by average of 19.65%;but distribution of phosphorus content in the plants was:stem>leaf>root;the distribution of potassium content in the thicket was:leaf>stem>root.Among them,the content of potassium in thick vines was highest under sandy environment,ncreased by average of 25.42%;In the analysis of root potassium content,the potassium content of vine thick roots under soil conditions was significantly higher than that under sand conditions,in Beihai(BT)and Fangchenggang Golden Beach(JS).Under the treatment,the content of magnesium in leaves was generally higher than that of roots and stems.The content of sodium in the roots of thick vines was generally lower than that in the same region,and the highest was in the BS area.5,JT grows in Fangchenggang,Jintan,China(JT).The growing condition of Ipomoea pes-caprae is good,and the growing condition is better than the sand growing condition under the native conditions.Ipomoea pes-caprae in this area are highly resistant.The comprehensive values of stress tolerance about different thick environment vines were:JT>BT>BS>JS. |
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