临猗县不同林龄苹果林地枯落物及土壤水源涵养功能研究.

To investigate the effects of different stand ages on the litter and soil water conservation ability in apple tree plantation, and clarify the water characteristics of apple tree plantation, is of great significance for establishing a reasonable orchard management system, consiolidating and expanding the achievements of poverty alleviation and realizing rural revitalization. Taking apple tree plantation of different stand ages (4, 6, 15 and 30 a) in Linyi County, Yuncheng City as the research object, this paper quantitatively described and studied the differences of litter and soil water conservation ability in apple tree plantation through field investigation and laboratory test. The results showed that： the total storage of the litter about the four stand ages in apple tree plantation ranged from 0. 82 to 2. 09 t/hm², the maximum water holding capacity ranged from 4. 91 to 13. 09 t/hm², and the water conservation capacity ranged from 3. 36 to 9. 38 t/hm² . With the increase of tree age, these parameters increased first and then decreased, and the maximum was 15 years old. There were good logarithmic and power function relationships between water holding capacity, water absorption rate and soaking time of litter layer respectively. Within the range of 0 to 60 cm, as the tree age increased, the soil bulk density decreased gradually, the total porosity and the maximum water holding increased gradually, and the maximum was 30 a. With the deepening of soil layer, the soil bulk density of apple tree plantation of different stand ages increased first and then decreased. Except 4 a, the total soil porosity of the remaining trees decreased gradually, but the difference between different soil layers was not significant. The maximum soil water holding capacity of 30 a orchard gradually decreased with the deepening of the soil layer, and the other trees showed a trend of decreasing first and then increasing at the age of 0 to 10 cm soil layer, and the minimum water holding capacity at 20 to 40 cm soil layer. According to the coordinate comprehensive evaluation method, the performance of litter and soil water conservation capacity of different stand ages was the strongest at the age of 15 years, the second at the age of 30 years, and the weakest at 4 a years. [ABSTRACT FROM AUTHOR]