Discussion on the compound management technology of Xiangshan and Huangjing in Huangshan City

Xiangxi is a native tree species in Huangshan District of Huangshan City. It is mainly distributed in towns and villages such as Xinming, Tangkou, Longmen, Jiaocun, Yucheng, Ganzi, Tanjiaqiao and Sankou. The varieties are mainly imported from Zhuji City, Zhejiang Province. At present, the investment in the early stage of afforestation in Huangshan District of Huangshan City needs to be more than 90,000 yuan/hm 2 , with a large investment and a long return on benefits, which has affected the enthusiasm of local farmers to develop the camphor industry.

Huangshan District of Huangshan City is a subtropical monsoon humid climate zone with mild climate, four distinct seasons and abundant rainfall. It is the natural distribution area of ​​camphor tree, which is one of the key industries to develop modern agriculture and promote precision poverty alleviation. The “Huangshan District Shannon Industry Development Plan” (2015-2020) was specially formulated. Therefore, the construction of the Xiangshan and Huangjing compound management projects in Huangshan District of Huangshan City has great advantages, which is in line with the industrial policy and regional development plan of Huangshan District of Huangshan City.

1. Compound management method of camphor and Huangjing

1. Woodland selection

Huang Jing has strong adaptability, is damp and wet, has strong cold resistance, and grows well in a humid environment. It is good for the fertile soil, sufficient surface water, and the upper layer of light-transmitting forest edge, grass or under-forest open area. The afforestation site should be selected from the artificially pure forest hills with an altitude of about 500 m, a pH of 5.0 to 6.5, a good drainage, a deep soil layer and a sandy loam. The existing young fragrant forests grow well with a density of 630 plants/hm 2 . Interplanting perennial yellow essence under the forest can avoid frequent soil tillage and exacerbate soil erosion.

2, planting yellow essence under the camphor forest

Breeding is mainly based on rhizome breeding. It is planted in September-October or March. The young part of the root rhizome is selected and cut into several sections, each section has 3-4 sections, the plant spacing is 0.4 m × 1.5 m, and the density is 15000. Strain / hm2. The yellow essence is planted in the whole hoe, the planting depth is 5cm, the soil is 3-5cm after planting, and the water is poured after a little suppression. Water is poured every 3-5 days later.

3, Huang Jing tending management

(1) cultivating weeds

During the seedling stage, the weeds grow fast and the soil is easy to be knotted. Therefore, weeding and weeding should be carried out in time. In each year of April, June and August, weeding and weeding should be carried out once. When weeding, it should be shallow and should not be deep to avoid root damage.

(2) Fertilization

Combined with cultivating alfalfa for fertilization, the compound fertilizer was applied 675~900 kg/hm 2 in April-July, and winter fertilizer was applied in November, and the soil fertilizer was 15.0~22.5 t/hm 2 + superphosphate 750 kg/hm. 2 + cake fertilizer 750 kg / hm 2 After mixing evenly, before the rain, open a small ditch between rows or between plants, and then immediately cultivating the soil cover fertilizer.

(3) timely irrigation and drainage

Huang Jingxi is wet and afraid of drought, so it is necessary to water the soil in a dry day, and drain it in time during the rainy season to prevent waterlogging and rotting roots.

(4) Removal of flowers

The flowering fruit period of Polygonatum lasts for a long time, and the excess inflorescence and fruit nutrient consumption are too much, which affects the growth of rhizome. Therefore, the flower buds should be removed in time before the flower buds are formed.

(5) Pest control

1 Leaf spot disease: Spray in the summer with 1:1:100 Bordeaux mixture or 65% Dyson zinc wettable powder 500~600 times, spray once every 5-7 days, continuously spray 2-3 times; 2 蛴螬: Control with 2.5% trichlorfon powder 30.0~37.5 kg/hm 2 + fine soil 1 125 kg/hm 2 .

Second, the benefit analysis

1. Economic benefits

Grafted seedlings were planted with ( 2+3 ) fine nutrient bags to form camphor forest. After 5 years, they entered the initial fruiting stage. The average yield of fresh fruit was 0.5 kg, and the annual output value reached 25 yuan/plant. Planting 630 plants/hm 2 , the annual output value can be Up to 15 750 yuan / hm 2 , 20 years of fragrant sorghum reached a high yield period, the benefits can reach more than 150,000 yuan / hm 2 . Under the camphor forest, the yellow essence can be harvested in about 4 years, and the rhizome of Rhizoma Polygonati is 7 500 kg/hm 2 , with an annual output value of 60,000 yuan/hm 2 .

2. Ecological benefits

Toona sinensis is a perennial evergreen tree, which is compounded with yellow essence under the camphor forest, which increases the biodiversity of the forest and improves the land use efficiency. At the same time, it will increase the vegetation coverage of forest land, increase the biomass within the forest, and improve the ability of afforestation ecosystems to resist forest pests.

3. Social benefits

The research and promotion of the compound management technology of camphor and Huangjing has expanded the scale and planting area of ​​the camphor industry, which has promoted the development of the camphor industry and improved the labor employment rate and the level of forestry technology.

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