Brown-red and brick-red argillaceous medium-fine grained sandstone and thin mudstone exposed by stars are loose after weathering, which are good raw materials for molding sand for cast iron. Drinking natural mineral water, mainly distributed in the western part of the region, has a large reserve of recoverable resources; The main natural gas producing areas are Luodai Town, Huang Tu Town, xihe town, Hong 'an Town and Tongan Street. The proven natural gas reserves are 30.7 billion cubic meters, with an annual output of 400 million to 600 million cubic meters. Gas supply has been incorporated into the pipe networks of Sinopec and PetroChina. There are also large areas of clay mines in the central and western parts of the region. The total water resources in Longquanyi District is 385.24 million cubic meters. It is mainly composed of surface water resources of 324 million cubic meters (excluding transit water) and groundwater resources of 6124 million cubic meters. Surface runoff is mainly produced by atmospheric precipitation. The average annual rainfall in Longquanyi District is 977.2 mm, and the corresponding total rainfall is 543 million cubic meters. Surface runoff generated by precipitation is collected behind the river and flows to Shuangliu, Xindu, Qingbaijiang, Jintang and Jianyang respectively. The average runoff depth is 330 mm, and the average surface runoff for many years is 65.438+0.84 billion cubic meters. The annual distribution and interannual variation of surface runoff in Longquanyi district are greatly influenced by precipitation, and the distribution is uneven during the year, about 70% of which is concentrated in the flood season, with great interannual variation.
In Chengdu shallow groundwater zoning, groundwater can be divided into two areas. One is the fractured water area (Ⅱ1) with sandy mudstone overlying red bed (J-K) in Taitai area, with a distribution area of 337 square kilometers, natural groundwater reserves of 56.55 million cubic meters and recoverable resources of18.94 million cubic meters. The other is the red bed (J-K) fissure water area in the hilly area of Longquan Mountain. The natural groundwater in Longquanyi District is 6 1.24 million cubic meters, and the total recoverable resources are 2 1.36 million cubic meters. In addition, since 1957, Dongfeng Canal has introduced Dujiangyan water into Longquanyi District, becoming an important source of industrial and agricultural water in Longquanyi District. The total water distribution provided by Dongfeng Canal to Longquanyi District every year is about 65.438+0.4 billion cubic meters. There are many kinds of plants in Longquanyi District, and forest vegetation and farmland vegetation are alternately distributed, with obvious differences between hills and dams. The zonal forest vegetation in Longquanyi District belongs to subtropical evergreen broad-leaved forest belt. Due to long-term human activities, natural virgin forest vegetation has been destroyed and replaced by natural secondary forest, artificially cultivated arbor forest, fruit tree forest and bamboo forest. In mountainous areas, all kinds of arbor forests and fruit trees are alternately distributed, while in Pingba, fruit trees coexist with surrounding trees and bamboo. The main forest vegetation types are natural secondary cypress, Pinus massoniana, Cyclobalanopsis glauca forest, artificially cultivated mixed forest and economic forest intercropped with forest and agriculture. The main forest plants are 57 families 145 species. Among them, the main timber trees are cypress, Pinus massoniana, Alnus cremastogyne, Cyclobalanopsis glauca, Cinnamomum camphora, Phoebe bournei, Ligustrum lucidum, Robinia pseudoacacia, Albizia Albizia, Ulmus pumila, Populus davidiana, artificially planted Pinus elliottii, Pinus loblollipop, Cupressus rosea (Mexican cypress), Italian poplar and so on. Economic trees mainly include tung tree, walnut, palm, mulberry, phellodendron, peach, loquat, grape, pear, orange, apple, cherry, plum and apricot. Bamboo mainly includes Dendrocalamus affinis, Bambusa bambusa, Dendrocalamus rigidus and Dendrocalamus latiflorus. Ginkgo biloba and Eucommia ulmoides are national second-class protected tree species, and Phoebe bournei and Red Bean are third-class protected tree species.