济南为什么射精会很快(济南龟头起皮是什么原因) (今日更新中)

WASHINGTON (AP) — For much of the United States, invasive grass species are making wildfires more frequent, especially in fire-prone California, a new study finds.Twelve non-native species act as "little arsonist grasses," said study co-author Bethany Bradley, a University of Massachusetts professor of environmental conservation.Wherever the common Mediterranean grass invades, including California's southern desert, fires flare up three times more often. And cheatgrass , which covers about one-third of the Intermountain West, is a big-time fire promoter, Bradley said."I would not be surprised at all if invasive grasses are playing a role in the current fires but I don't think we can attribute to them directly," Bradley said.University of Utah fire expert Phil Dennison, who wasn't part of the study but says it makes sense, said, "In a lot of ways, California was ground zero for invasive grasses. Much of California's native perennial grassland was replaced by Mediterranean annual grasses over a century ago. This study doesn't look at invasive grasses in the areas that are burning in California, but invasive grasses are contributing to the fires there."Experts say the areas burning now in California are more shrubs and grasses than forests, despite what President Donald Trump tweeted over the weekend."This is a global problem," said University of Alberta fire expert Mike Flannigan, who wasn't part of the study but said it makes sense. "I think with climate change and human assistance we are moving to a grass world. One region they should have mentioned is Hawaii where wildfires are increasing in large part due to invasive grasses."Invasive species are spreading more because of climate change as warmer weather moves into new areas, said study lead author Emily Fusco, also of the University of Massachusetts. New England and the Mid-Atlantic are seeing new invasive and more flammable grasses, Bradley said.The study in Monday's journal Proceedings of the National Academy of Sciences looks at the connections between a dozen species of invasive grasses and fires nationwide, finding fires occur more often in places with the non-native grasses. But the study did not find a link between invasive grasses and the size of the fires.Four of these species, including cheatgrass and common Mediterranean grass, are in California. These grasses get dry and then watch out, Fusco said."When you start a fire normally you want kindling," Fusco said. "The grasses are, more or less, like kindling"If someone lights a match and throws in the middle of a forest, it is unlikely a fire will start, but throw it in a field of cheatgrass "and odds are that it's going to catch," Bradley said."We are the reason that invasive species are here. We are the reason that they get spread around," Bradley said.Flanagan noted that invasive plants that are not grasses also feed the wildfire problem.While most outside experts said the study was important, wildfire expert LeRoy Westerling at the University of California, Merced said that with wildfires the size is key so this study is less valuable because it measures frequency.While size matters in forest fires, study author Bradley said mid to small size fires are the ones "in everybody's backyard" and affect people and their buildings more. 3313

Visitors are now able to enter the White House complex without having their temperatures checked for the first time since mid-March, although several other coronavirus precautions remain in place. Those who come near the president will still undergo temperature checks and testing for the virus. Over the past three months, those seeking to access the complex first had to get their temperatures checked and answer a question about whether they had experienced any symptoms associated with COVID-19. The White House says it is scaling back complex-wide temperature checks now that the District of Columbia is entering phase two of its reopening. 653

WASHINGTON (AP) — A federal appeals court has ruled that the first federal execution in nearly two decades can proceed as scheduled on Monday. The ruling from the 7th U.S. Circuit Court of Appeals overturns a lower court order that had put the execution of 47-year-old Daniel Lewis Lee on hold. Lee, of Yukon, Oklahoma, had been scheduled to die by lethal injection on Monday at a federal prison in Indiana.He was convicted in Arkansas of the 1996 killings of gun dealer William Mueller, his wife, Nancy, and her 8-year-old daughter, Sarah Powell. 555

WASHINGTON — The Supreme Court is denying Congress access to secret grand jury testimony from special counsel Robert Mueller’s Russia investigation through the November election. The justices agreed Thursday to hear the Trump administration’s appeal of a lower court order for the material to be turned over to the Democratic-controlled House of Representatives. The high court’s action will keep the documents out of congressional hands at least until the case is resolved, which is not likely to happen before 2021. The delay is a victory for Trump, who also is mounting a court fight against congressional efforts to obtain his banking and other financial records. 675

Video footage shows the drug raid where Detroit police officers from two precincts got into a violent confrontation with one another.  147

来源：资阳报