翻译成英语：植物群落受到的干旱影响是一个重要的生态问题，它会影响到生物多样性，干旱会导致植物群落的构成发生变化，从而影响到植物的繁殖、种群分布和物种结构等。不同种类的植物旱时作出的发应不同。研究表明，在遭受干旱时植物的种类和数量对于植物能否适应这种环境起着至关重要的作用。植物的种类越多，数量越多，就越能适应干旱条件。

The effects of drought on plant communities is an important ecological issue, which affects biodiversity. Drought can cause changes in the composition of plant communities, and in turn, affect the reproduction, distribution and species structure of plants. Different types of plants respond differently to drought. Studies have shown that the species and number of plants play a crucial role in their ability to adapt to the environment when subjected to drought. The more species and numbers of plants, the better they can adapt to dry conditions.