N. Question Answers Timestamped Validation
1 How did grazing pressure changed? Increasing grazing pressure changed from being predominantly positive in colder drylands with low precipitation seasonality and a higher diversity of plant species to be negative in hotter drylands with a lower diversity of plant species and a higher precipitation seasonality. [[1]]
2 What is the relationship between plants, grazing animals and the ecosystem? There is a positive connection between, on the one hand, diversity among vascular plants and large grazing animals and, on the other, the provision of essential ecosystem services such as carbon storage, which plays a fundamental role in regulating the climate.   [[2]]
3 How much of Earth's land surface is dryland? 41% of Earth is dryland
4 What is the share humans and animals living on drylands? 50% of all livestock live on dryland and one in three humans [[3]]
5 What is best for nature between seasonal grazing and long-term animal exclusion? Seasonal grazing, including strategic rest periods, is generally better for rangeland vegetation than long-term animal exclusion. [[4]]
6 What is characterized by a set of communities considerable their physiognomy?     The arid steppe vegetation. [[5]]
7 What is one of the main management practices use to protect plant communities?      Fencing. [[6]]
8 What is the central goal of comparative ecology? To understand the diversity of functional and life history strategies among co-occurrence species.[[7]]
9 What types of plants are found in the arid steppe vegetation?   Grasses, forbs, and shrubs.[[8]]
10 What are the constraints on vegetation cover?   Soil and climate conditions and human activities.[[9]]
11 What is the current state of the vegetation in Tunisia?    Degradation and desertification.[[10]]
12 What is the benefit of fencing? It significantly improves the aboveground vegetation productivity but decreases plant diversity and density after long protection.[[11]]
13 What is the main benefit of seasonal grazing? Better for rangeland vegetation than long term animal exclusion .[[12]]
14 What is the Raunkiaer biologic types?    A classification of plants, proposed by the Danish botanist C.Raunkiaer, based on the position of perennating buds in relation to the soil surface.[13]
15 How many types of classification can be used to predict the response of natural vegetation to climate changes and variations?   Three .[[14]]
16 How can be assessed the impact of applied managements on arid ecosystems? With Hybrid classification.[[15]]
17 What can be useful for understanding vegetation physiognomy and the resilience ability of the ecosystems?   A combination of the three types of classification .[[16]]