苗木保存率怎么测
造林保存率国家规定标准
The afforestation survival rate refers to the percentage of afforestation area that meets the specified tree survival and density standards to the cumulative afforestation area. In general, the survival rate is higher than the retention rate. With proper management after afforestation, the survival rate can be improved even after planting.
植被恢复成活率要求
After the vegetation is restored, the annual survival rate of seedlings should not be less than 85%. At the end of the maintenance period, the survival rate of seedlings in mountainous areas, high altitude regions, and other special areas should not be less than 75%, while in plains and other suitable forest areas, it should not be less than 80%. Reforestation is essential to ensure that the forest area does not decrease and the forest quality is maintained.
买的树苗能放几天
In open air, most tree seedlings of various species can only be stored for 2-3 days. Therefore, it is crucial to plant them as soon as possible to prevent the seedlings from suffering and deteriorating. Time is indeed essential when it comes to preserving the vitality of tree seedlings.
苗木怎么贮藏
For indoor storage, seedlings can be placed in a well-ventilated and shaded area to avoid direct exposure to sunlight and extreme cold. When it comes to outdoor storage, seedlings can be directly buried in soil or wrapped in soil, peat, or dust to protect them from external elements.
冬天怎样存放买的树苗
During winter, it is advisable to store the purchased tree seedlings in a sunny, dry, and well-drained location. Dig a trench about 60-80 cm wide and around 70 cm deep, with the length depending on the number of seedlings. Additionally, attention should be paid to the storage conditions to ensure the seedlings\' survival.
苗木的养护期应怎么计
The maintenance period for tree seedlings in landscaping projects begins counting from the day of completion and acceptance of the project. It is important to adhere to the specified maintenance period to ensure the healthy growth of the seedlings.
树苗保管方法
When it comes to preserving tree seedlings, it is essential to maintain adequate moisture levels without overwatering. Watering once a week is generally sufficient, with the amount and frequency adjusted based on the tree species and environmental conditions. Furthermore, proper sunlight exposure is crucial for the healthy growth of seedlings.
买树怎么买
Purchasing tree seedlings can be done through nurseries, online platforms, or tree markets. Tree markets serve as convenient avenues for acquiring seedlings for urban greening or personal planting needs. It is essential to choose reputable suppliers to ensure the quality of the purchased seedlings.
拔出来的树苗怎么保持叶子新鲜
As summer approaches and temperatures rise, transporting seedlings becomes essential to maintain their survival rate. To ensure that the seedlings remain fresh during transit, especially for delicate varieties like large leaf boxwoods and golden privets, proper care must be taken to preserve their freshness and vitality until they are planted at the designated site.
应用所学知识，分析下列实验，并回答问题
1. The experiments conducted by the scientists mentioned above are all related to the study of photosynthesis.
2. Experiment One: In 1648, Haiermont irrigated tree seedlings with pure rainwater, and after five years, he discovered that the seedlings had gained over 80 kilograms in weight, surpassing the growth in control conditions. This highlights the importance of water quality and its impact on plant growth.
